Update to Drupal 8.0.6. For more information, see https://www.drupal.org/drupal-8.0.6-release-notes

core/lib/Drupal/Core/Entity/EntityHandlerBase.php

@@ -18,6 +18,8 @@ use Drupal\Core\StringTranslation\StringTranslationTrait;
  *   Implement the container injection pattern of
  *   \Drupal\Core\Entity\EntityHandlerInterface::createInstance() to obtain the
  *   module handler service for your class.
+ *
+ * @ingroup entity_api
  */
 abstract class EntityHandlerBase {
   use StringTranslationTrait;

core/lib/Drupal/Core/Entity/EntityHandlerInterface.php

@@ -14,6 +14,8 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
  *
  * This interface can be implemented by entity handlers that require
  * dependency injection.
+ *
+ * @ingroup entity_api
  */
 interface EntityHandlerInterface {
 

core/lib/Drupal/Core/Entity/entity.api.php

@@ -277,8 +277,8 @@ use Drupal\node\Entity\NodeType;
  *   content entity type that uses bundles, the 'bundle_label' annotation gives
  *   the human-readable name to use for a bundle of this entity type (for
  *   example, "Content type" for the Node entity).
- * - The annotation will refer to several controller classes, which you will
- *   also need to define:
+ * - The annotation will refer to several handler classes, which you will also
+ *   need to define:
  *   - list_builder: Define a class that extends
  *     \Drupal\Core\Config\Entity\ConfigEntityListBuilder (for configuration
  *     entities) or \Drupal\Core\Entity\EntityListBuilder (for content
@@ -298,7 +298,7 @@ use Drupal\node\Entity\NodeType;
  *     annotation has value TRUE), define a class that extends
  *     \Drupal\content_translation\ContentTranslationHandler, to translate
  *     the content. Configuration translation is handled automatically by the
- *     Configuration Translation module, without the need of a controller class.
+ *     Configuration Translation module, without the need of a handler class.
  *   - access: If your configuration entity has complex permissions, you might
  *     need an access control handling, implementing
  *     \Drupal\Core\Entity\EntityAccessControlHandlerInterface, but most entities
@@ -381,10 +381,10 @@ use Drupal\node\Entity\NodeType;
  *   an object to the controller for the route.
  * - defaults: For entity form routes, use _entity_form rather than the generic
  *   _controller or _form. The value is composed of the entity type machine name
- *   and a form controller type from the entity annotation (see @ref define
- *   above more more on controllers and annotation). So, in this example,
- *   block.default refers to the 'default' form controller on the block entity
- *   type, whose annotation contains:
+ *   and a form handler type from the entity annotation (see @ref define above
+ *   more more on handlers and annotation). So, in this example, block.default
+ *   refers to the 'default' form handler on the block entity type, whose
+ *   annotation contains:
  *   @code
  *   handlers = {
  *     "form" = {