diff --git a/core/lib/Drupal/Core/Extension/ExtensionList.php b/core/lib/Drupal/Core/Extension/ExtensionList.php
index 2bc63e8..bc54b10 100644
--- a/core/lib/Drupal/Core/Extension/ExtensionList.php
+++ b/core/lib/Drupal/Core/Extension/ExtensionList.php
@@ -158,7 +158,7 @@ protected function getCacheId() {
    *   The machine name of the extension.
    *
    * @return bool
-   *   true if the extension exists (whether installed or not) and false if not.
+   *   True if the extension exists (whether installed or not) and false if not.
    */
   public function extensionExists($name) {
     $extensions = $this->listExtensions();
@@ -425,7 +425,7 @@ public function getFilename($extension_name) {
     if (isset($this->addedFileNames[$extension_name])) {
       return $this->addedFileNames[$extension_name];
     }
-    else if (isset($this->fileNames[$extension_name])) {
+    elseif (isset($this->fileNames[$extension_name])) {
       return $this->fileNames[$extension_name];
     }
     throw new \InvalidArgumentException("The {$this->type} $extension_name does not exist.");
diff --git a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
index 088f3e4..14521b7 100644
--- a/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
+++ b/core/lib/Drupal/Core/Extension/ModuleExtensionList.php
@@ -158,7 +158,7 @@ protected function ensureRequiredDependencies(Extension $module, array $modules
           $modules[$dependency_name]->info['required'] = TRUE;
           $modules[$dependency_name]->info['explanation'] = $this->t('Dependency of required module @module', array('@module' => $module->info['name']));
           // Ensure any dependencies it has are required.
-         $this->ensureRequiredDependencies($modules[$dependency_name], $modules);
+          $this->ensureRequiredDependencies($modules[$dependency_name], $modules);
         }
       }
     }
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php b/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
index 3d61d2e..cfc6323 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
@@ -311,6 +311,9 @@ public function getModuleDirectories();
    * @return string
    *   Returns the human readable name of the module or the machine name passed
    *   in if no matching module is found.
+   *
+   * @deprecated in Drupal 8.2.0, will be removed before Drupal 9.0.0.
+   *   Use \Drupal::service('module_listing')->getName() instead.
    */
   public function getName($module);
 
diff --git a/core/lib/Drupal/Core/Session/AccountProxyInitializedInterface.php b/core/lib/Drupal/Core/Session/AccountProxyInitializedInterface.php
index 11a0644..550f051 100644
--- a/core/lib/Drupal/Core/Session/AccountProxyInitializedInterface.php
+++ b/core/lib/Drupal/Core/Session/AccountProxyInitializedInterface.php
@@ -7,12 +7,16 @@
 
 namespace Drupal\Core\Session;
 
+/**
+ * Extends the account proxy interface with a "is initialized" method.
+ */
 interface AccountProxyInitializedInterface extends AccountProxyInterface {
 
   /**
    * Returns whether the account is already initialized.
    *
    * @return bool
+   *   TRUE, when the account was initialized already.
    */
   public function accountIsInitialized();