diff --git a/contextual_links_example/contextual_links_example.module b/contextual_links_example/contextual_links_example.module
index b063edb..c02cea8 100644
--- a/contextual_links_example/contextual_links_example.module
+++ b/contextual_links_example/contextual_links_example.module
@@ -1,6 +1,13 @@
 <?php
 
 /**
+ * @file
+ * Shows how to use Drupal's contextual links functionality.
+ *
+ * @see https://www.drupal.org/docs/8/api/menu-api/providing-module-defined-contextual-links
+ */
+
+/**
  * Implements hook_theme().
  */
 function contextual_links_example_theme() {
@@ -8,7 +15,7 @@ function contextual_links_example_theme() {
     'contextual_links_example_entity' => [
       'template' => 'contextual-links-example-entity',
       'render element' => 'element',
-    ]
+    ],
   ];
 }
 
@@ -20,4 +27,4 @@ function template_preprocess_contextual_links_example_entity(&$variables) {
   // variables that we will print in the template file.
   $variables['title'] = $variables['element']['#object']->titleContent();
   $variables['content'] = $variables['element']['#object']->bodyContent();
-}
\ No newline at end of file
+}
diff --git a/contextual_links_example/contextual_links_example.routing.yml b/contextual_links_example/contextual_links_example.routing.yml
index eee3d38..c2febee 100644
--- a/contextual_links_example/contextual_links_example.routing.yml
+++ b/contextual_links_example/contextual_links_example.routing.yml
@@ -12,7 +12,7 @@ contextual_links_example.contextual_links_object_list:
   path: 'examples/contextual-links'
   defaults:
     _title: 'Contextual links example list objects'
-    _controller: '\Drupal\contextual_links_example\Controller\CLEController::cle_page'
+    _controller: '\Drupal\contextual_links_example\Controller\CLEController::clePage'
   requirements:
     _access: 'TRUE'
 
@@ -20,7 +20,7 @@ contextual_links_example.contextual_links_object_view:
   path: 'examples/contextual-links/{entity_id}'
   defaults:
     _title: 'Contextual links example object'
-    _controller: '\Drupal\contextual_links_example\Controller\CLEController::cle_content'
+    _controller: '\Drupal\contextual_links_example\Controller\CLEController::cleContent'
   requirements:
     entity_id: \d+
     _access: 'TRUE'
diff --git a/contextual_links_example/src/Controller/CLEController.php b/contextual_links_example/src/Controller/CLEController.php
index b9579aa..dc23231 100644
--- a/contextual_links_example/src/Controller/CLEController.php
+++ b/contextual_links_example/src/Controller/CLEController.php
@@ -5,12 +5,15 @@ namespace Drupal\contextual_links_example\Controller;
 use Drupal\contextual_links_example\Entity\CLEEntity;
 use Drupal\Core\Controller\ControllerBase;
 
+/**
+ * Controller routines for contextual example routes.
+ */
 class CLEController extends ControllerBase {
 
   /**
    * Returns a list of CLEEntity objects.
    */
-  public function cle_page() {
+  public function clePage() {
     // For simplicity we hardcode an array of CLEEntity ids.
     $entity_ids = [1, 2, 3, 4, 5];
 
@@ -33,6 +36,7 @@ class CLEController extends ControllerBase {
   }
 
   /**
+   * Returns CLEEntity.
    *
    * @param int $entity_id
    *   Entity ID.
@@ -40,11 +44,11 @@ class CLEController extends ControllerBase {
    * @return array
    *   An array as expected by drupal_render().
    */
-  public function cle_content(int $entity_id) {
-    $build = array(
+  public function cleContent(int $entity_id) {
+    $build = [
       '#theme' => 'contextual_links_example_entity',
       '#object' => new CLEEntity(['id' => $entity_id], 'contextual_links_example_entity'),
-    );
+    ];
     return $build;
   }
 
diff --git a/contextual_links_example/src/Entity/CLEEntity.php b/contextual_links_example/src/Entity/CLEEntity.php
index 2b4dc97..090b8a0 100644
--- a/contextual_links_example/src/Entity/CLEEntity.php
+++ b/contextual_links_example/src/Entity/CLEEntity.php
@@ -28,9 +28,9 @@ class CLEEntity extends Entity {
    *   Renderable array of the entity's body.
    */
   public function bodyContent() {
-    return array(
+    return [
       '#markup' => t('This is the content of example object @id.', ['@id' => $this->id()]),
-    );
+    ];
   }
 
   /**
@@ -40,9 +40,9 @@ class CLEEntity extends Entity {
    *   Renderable array of the entity's title.
    */
   public function titleContent() {
-    return array(
+    return [
       '#markup' => t('Title for example object @id', ['@id' => $this->id()]),
-    );
+    ];
   }
 
 }
diff --git a/contextual_links_example/src/Form/CLEEntityEditForm.php b/contextual_links_example/src/Form/CLEEntityEditForm.php
index 42107e8..cf4fca2 100644
--- a/contextual_links_example/src/Form/CLEEntityEditForm.php
+++ b/contextual_links_example/src/Form/CLEEntityEditForm.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\contextual_links_example\Form;
 
-
 use Drupal\contextual_links_example\Entity\CLEEntity;
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
@@ -24,6 +23,7 @@ class CLEEntityEditForm extends FormBase {
    * @param \Drupal\Core\Form\FormStateInterface $form_state
    *   An associative array containing the current state of the form.
    * @param int $entity_id
+   *   Entity ID.
    *
    * @return array
    *   An associative array containing the robot add/edit form.
diff --git a/contextual_links_example/src/Form/ContextualLinksExampleNodeActionForm.php b/contextual_links_example/src/Form/ContextualLinksExampleNodeActionForm.php
index a4ea0ca..7592ca3 100644
--- a/contextual_links_example/src/Form/ContextualLinksExampleNodeActionForm.php
+++ b/contextual_links_example/src/Form/ContextualLinksExampleNodeActionForm.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\contextual_links_example\Form;
 
-
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\node\NodeInterface;
@@ -20,9 +19,9 @@ class ContextualLinksExampleNodeActionForm extends FormBase {
   /**
    * The form ID. Unique string identifying the form.
    *
-   * @see getFormID()
-   *
    * @var string
+   *
+   * @see getFormID()
    */
   protected $formId = "contextual_links_example_node_action";
 
@@ -56,7 +55,7 @@ class ContextualLinksExampleNodeActionForm extends FormBase {
    *   An associative array containing the structure of the form.
    * @param \Drupal\Core\Form\FormStateInterface $form_state
    *   The current state of the form.
-   * @param \Drupal\node\NodeInterface
+   * @param \Drupal\node\NodeInterface $node
    *   The node from the URL context.
    *
    * @return array
@@ -117,7 +116,6 @@ class ContextualLinksExampleNodeActionForm extends FormBase {
     return $this->node->id();
   }
 
-
   /**
    * Returns the title of the current node.
    *
diff --git a/contextual_links_example/src/Plugin/Block/CLEBlock.php b/contextual_links_example/src/Plugin/Block/CLEBlock.php
index 98cfed6..f7d0d12 100644
--- a/contextual_links_example/src/Plugin/Block/CLEBlock.php
+++ b/contextual_links_example/src/Plugin/Block/CLEBlock.php
@@ -18,6 +18,7 @@ use Drupal\Core\Block\BlockBase;
  * )
  */
 class CLEBlock extends BlockBase {
+
   /**
    * {@inheritdoc}
    */
diff --git a/contextual_links_example/src/Storage/CLEStorage.php b/contextual_links_example/src/Storage/CLEStorage.php
index f14b53f..403ed1f 100644
--- a/contextual_links_example/src/Storage/CLEStorage.php
+++ b/contextual_links_example/src/Storage/CLEStorage.php
@@ -1,12 +1,7 @@
 <?php
-/**
- * @file
- * Contains \Drupal\contextual_links_example\Storage\CLEStorage.
- */
 
 namespace Drupal\contextual_links_example\Storage;
 
-
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
 
@@ -22,176 +17,98 @@ use Drupal\Core\Entity\EntityStorageInterface;
 class CLEStorage implements EntityStorageInterface {
 
   /**
-   * Resets the internal, static entity cache.
-   *
-   * @param $ids
-   *   (optional) If specified, the cache is reset for the entities with the
-   *   given ids only.
+   * {@inheritdoc}
    */
   public function resetCache(array $ids = NULL) {
     // TODO: Implement resetCache() method.
   }
 
   /**
-   * Loads one or more entities.
-   *
-   * @param $ids
-   *   An array of entity IDs, or NULL to load all entities.
-   * @return \Drupal\Core\Entity\EntityInterface[]
-   *   An array of entity objects indexed by their IDs. Returns an empty array
-   *   if no matching entities found.
+   * {@inheritdoc}
    */
   public function loadMultiple(array $ids = NULL) {
     // TODO: Implement loadMultiple() method.
   }
 
   /**
-   * Loads one entity.
-   *
-   * @param mixed $id
-   *   The ID of the entity to load.
-   * @return \Drupal\Core\Entity\EntityInterface|null
-   *   An entity object. NULL if no matching entity is found.
+   * {@inheritdoc}
    */
   public function load($id) {
     // TODO: Implement load() method.
   }
 
   /**
-   * Loads an unchanged entity from the database.
-   *
-   * @param mixed $id
-   *   The ID of the entity to load.
-   * @return \Drupal\Core\Entity\EntityInterface|null
-   *   The unchanged entity, or NULL if the entity cannot be loaded.
-   * @todo Remove this method once we have a reliable way to retrieve the
-   *   unchanged entity from the entity object.
+   * {@inheritdoc}
    */
   public function loadUnchanged($id) {
     // TODO: Implement loadUnchanged() method.
   }
 
   /**
-   * Load a specific entity revision.
-   *
-   * @param int $revision_id
-   *   The revision id.
-   * @return \Drupal\Core\Entity\EntityInterface|null
-   *   The specified entity revision or NULL if not found.
+   * {@inheritdoc}
    */
   public function loadRevision($revision_id) {
     // TODO: Implement loadRevision() method.
   }
 
   /**
-   * Delete a specific entity revision.
-   * A revision can only be deleted if it's not the currently active one.
-   *
-   * @param int $revision_id
-   *   The revision id.
+   * {@inheritdoc}
    */
   public function deleteRevision($revision_id) {
     // TODO: Implement deleteRevision() method.
   }
 
   /**
-   * Load entities by their property values.
-   *
-   * @param array $values
-   *   An associative array where the keys are the property names and the
-   *   values are the values those properties must have.
-   * @return array
-   *   An array of entity objects indexed by their ids.
+   * {@inheritdoc}
    */
-  public function loadByProperties(array $values = array()) {
+  public function loadByProperties(array $values = []) {
     // TODO: Implement loadByProperties() method.
   }
 
   /**
-   * Constructs a new entity object, without permanently saving it.
-   *
-   * @param array $values
-   *   (optional) An array of values to set, keyed by property name. If the
-   *   entity type has bundles, the bundle key has to be specified.
-   * @return \Drupal\Core\Entity\EntityInterface
-   *   A new entity object.
+   * {@inheritdoc}
    */
-  public function create(array $values = array()) {
+  public function create(array $values = []) {
     // TODO: Implement create() method.
   }
 
   /**
-   * Deletes permanently saved entities.
-   *
-   * @param array $entities
-   *   An array of entity objects to delete.
-   * @throws \Drupal\Core\Entity\EntityStorageException
-   *   In case of failures, an exception is thrown.
+   * {@inheritdoc}
    */
   public function delete(array $entities) {
     // TODO: Implement delete() method.
   }
 
   /**
-   * Saves the entity permanently.
-   *
-   * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entity to save.
-   * @return
-   *   SAVED_NEW or SAVED_UPDATED is returned depending on the operation
-   *   performed.
-   * @throws \Drupal\Core\Entity\EntityStorageException
-   *   In case of failures, an exception is thrown.
+   * {@inheritdoc}
    */
   public function save(EntityInterface $entity) {
     // TODO: Implement save() method.
   }
 
   /**
-   * Returns an entity query instance.
-   *
-   * @param string $conjunction
-   *   (optional) The logical operator for the query, either:
-   *   - AND: all of the conditions on the query need to match.
-   *   - OR: at least one of the conditions on the query need to match.
-   * @return \Drupal\Core\Entity\Query\QueryInterface
-   *   The query instance.
-   * @see \Drupal\Core\Entity\EntityStorageBase::getQueryServiceName()
+   * {@inheritdoc}
    */
   public function getQuery($conjunction = 'AND') {
     // TODO: Implement getQuery() method.
   }
 
   /**
-   * Returns an aggregated query instance.
-   *
-   * @param string $conjunction
-   *   (optional) The logical operator for the query, either:
-   *   - AND: all of the conditions on the query need to match.
-   *   - OR: at least one of the conditions on the query need to match.
-   * @return \Drupal\Core\Entity\Query\QueryAggregateInterface
-   *   The aggregated query object that can query the given entity type.
-   * @see \Drupal\Core\Entity\EntityStorageBase::getQueryServiceName()
+   * {@inheritdoc}
    */
   public function getAggregateQuery($conjunction = 'AND') {
     // TODO: Implement getAggregateQuery() method.
   }
 
   /**
-   * Returns the entity type ID.
-   *
-   * @return string
-   *   The entity type ID.
+   * {@inheritdoc}
    */
   public function getEntityTypeId() {
     // TODO: Implement getEntityTypeId() method.
   }
 
   /**
-   * Returns the entity type definition.
-   *
-   * @return \Drupal\Core\Entity\EntityTypeInterface
-   *   Entity type definition.
+   * {@inheritdoc}
    */
   public function getEntityType() {
     // TODO: Implement getEntityType() method.
diff --git a/contextual_links_example/tests/src/Functional/ContextualLinksExampleTest.php b/contextual_links_example/tests/src/Functional/ContextualLinksExampleTest.php
index f3f0247..fd41a95 100644
--- a/contextual_links_example/tests/src/Functional/ContextualLinksExampleTest.php
+++ b/contextual_links_example/tests/src/Functional/ContextualLinksExampleTest.php
@@ -5,7 +5,7 @@ namespace Drupal\Tests\contextual_links_example\Functional;
 use Drupal\Tests\BrowserTestBase;
 
 /**
- * Tests the behavior of the contextual links provided by the Contextual links example module.
+ * Tests the behavior of the contextual links provided by the module.
  *
  * @ingroup contextual_links_example
  *
@@ -19,7 +19,7 @@ class ContextualLinksExampleTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('contextual', 'contextual_links_example');
+  public static $modules = ['contextual', 'contextual_links_example'];
 
   /**
    * The installation profile to use with this test.
@@ -33,10 +33,14 @@ class ContextualLinksExampleTest extends BrowserTestBase {
   /**
    * Enable modules and create user with specific permissions.
    */
-  protected function setUp(): void {
+  protected function setUp() {
     parent::setUp();
     // Create user.
-    $web_user = $this->drupalCreateUser(['access contextual links', 'bypass node access', 'administer blocks']);
+    $web_user = $this->drupalCreateUser([
+      'access contextual links',
+      'bypass node access',
+      'administer blocks',
+    ]);
     // Login the admin user.
     $this->drupalLogin($web_user);
 
@@ -48,7 +52,7 @@ class ContextualLinksExampleTest extends BrowserTestBase {
   /**
    * Test for a link to the contextual example in the Tools menu.
    */
-  public function testContextualExampleLink(): void {
+  public function testContextualExampleLink() {
     $this->drupalGet('');
     $this->assertSession()->linkByHrefExists('examples/contextual-links');
   }
@@ -56,7 +60,7 @@ class ContextualLinksExampleTest extends BrowserTestBase {
   /**
    * Tests contextual_links_example menus.
    */
-  public function ContextualExampleMenu(): void {
+  public function testContextualExampleMenu() {
     $this->drupalGet('examples/contextual-links');
     $this->assertSession()->statusCodeEquals(200);
   }
@@ -64,7 +68,7 @@ class ContextualLinksExampleTest extends BrowserTestBase {
   /**
    * Tests contextual_links_example functionality.
    */
-  public function testContextualLinksExampleBasic(): void {
+  public function testContextualLinksExampleBasic() {
     $assert = $this->assertSession();
 
     $this->drupalGet('');