Issue #3484365 by nexusnovaz, joachim: docs for...

Issue #3484365 by nexusnovaz, joachim: docs for EntityTypeInterface::getBundleOf() should say entity type *id*

(cherry picked from commit 6c280ff8)

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

@@ -480,15 +480,15 @@ public function setLinkTemplate($key, $path);
   public function getBundleEntityType();
 
   /**
-   * Gets the entity type for which this entity provides bundles.
+   * Gets the entity type ID for which this entity provides bundles.
    *
    * It can be used by other modules to act accordingly; for example,
    * the Field UI module uses it to add operation links to manage fields and
    * displays.
    *
    * @return string|null
-   *   The entity type for which this entity provides bundles, or NULL if does
-   *   not provide bundles for another entity type.
+   *   The entity type ID for which this entity provides bundles, or NULL if
+   *   does not provide bundles for another entity type.
    */
   public function getBundleOf();