diff --git a/core/modules/config/lib/Drupal/config/Controller/ConfigController.php b/core/modules/config/lib/Drupal/config/Controller/ConfigController.php
index 5f4e8e2..3f54d0a 100644
--- a/core/modules/config/lib/Drupal/config/Controller/ConfigController.php
+++ b/core/modules/config/lib/Drupal/config/Controller/ConfigController.php
@@ -47,7 +47,11 @@ class ConfigController implements ControllerInterface {
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
-    return new static($container->get('config.storage'), $container->get('config.storage.staging'), $container->get('module_handler'));
+    return new static(
+      $container->get('config.storage'),
+      $container->get('config.storage.staging'),
+      $container->get('module_handler')
+    );
   }
 
   /**
diff --git a/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php b/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php
index 252633b..752dbaf 100644
--- a/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php
+++ b/core/modules/image/lib/Drupal/image/Controller/ImageStyleController.php
@@ -81,12 +81,13 @@ public static function create(ContainerInterface $container) {
    *   The request object.
    * @param string $scheme
    *   The file scheme, defaults to 'private'.
-   * @param $image_style
+   * @param string $image_style
    *   The image style to deliver.
    *
    * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
    *
-   * @return BinaryFileResponse|Response
+   * @return \Symfony\Component\HttpFoundation\BinaryFileResponse|\Symfony\Component\HttpFoundation\Response
+   *   The transferred file as response or some error response.
    */
   public function deliver(Request $request, $scheme, $image_style) {
     $target = $request->query->get('file');
diff --git a/core/modules/image/lib/Drupal/image/EventSubscriber/RouteSubscriber.php b/core/modules/image/lib/Drupal/image/EventSubscriber/RouteSubscriber.php
index 17e460f..c0dde68 100644
--- a/core/modules/image/lib/Drupal/image/EventSubscriber/RouteSubscriber.php
+++ b/core/modules/image/lib/Drupal/image/EventSubscriber/RouteSubscriber.php
@@ -26,13 +26,15 @@ public static function getSubscribedEvents() {
   }
 
   /**
-   * Register dynamic routes for image styles.
+   * Registers dynamic routes for image styles.
    *
-   * Generate image derivatives of publicly available files.
-   * If clean URLs are disabled, image derivatives will always be served
-   * through the menu system.
-   * If clean URLs are enabled and the image derivative already exists,
-   * PHP will be bypassed.
+   * Generate image derivatives of publicly available files. If clean URLs are
+   * disabled, image derivatives will always be served through the menu system.
+   * If clean URLs are enabled and the image derivative already exists, PHP will
+   * be bypassed.
+   *
+   * @param \Drupal\Core\Routing\RouteBuildEvent $event
+   *   The route building event.
    */
   public function dynamicRoutes(RouteBuildEvent $event) {
     $collection = $event->getRouteCollection();
diff --git a/core/modules/system/lib/Drupal/system/FileController.php b/core/modules/system/lib/Drupal/system/FileController.php
index c516ac6..d60e459 100644
--- a/core/modules/system/lib/Drupal/system/FileController.php
+++ b/core/modules/system/lib/Drupal/system/FileController.php
@@ -42,7 +42,9 @@ public function __construct(ModuleHandlerInterface $module_handler) {
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
-    return new static($container->get('module_handler'));
+    return new static(
+      $container->get('module_handler')
+    );
   }
 
   /**
@@ -65,7 +67,7 @@ public static function create(ContainerInterface $container) {
    * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
    *   Thrown when the requested file does not exist.
    * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
-   *   Thrown when the
+   *   Thrown when the user does not have access to the file.
    *
    * @return \Symfony\Component\HttpFoundation\BinaryFileResponse
    *   The transferred file as response.
diff --git a/core/modules/system/lib/Drupal/system/PathProcessor/PathProcessorFiles.php b/core/modules/system/lib/Drupal/system/PathProcessor/PathProcessorFiles.php
index a7baa41..bd1ee07 100644
--- a/core/modules/system/lib/Drupal/system/PathProcessor/PathProcessorFiles.php
+++ b/core/modules/system/lib/Drupal/system/PathProcessor/PathProcessorFiles.php
@@ -10,6 +10,9 @@
 use Drupal\Core\PathProcessor\InboundPathProcessorInterface;
 use Symfony\Component\HttpFoundation\Request;
 
+/**
+ * Defines a path processor to rewrite file URLs.
+ */
 class PathProcessorFiles implements InboundPathProcessorInterface {
 
   /**