Issue #2473093: Improve default grant documentation

Closes #2473093

core/modules/node/src/NodeAccessControlHandlerInterface.php

@@ -30,6 +30,8 @@ public function acquireGrants(NodeInterface $node);
 
   /**
    * Creates the default node access grant entry on the grant storage.
+   *
+   * @see \Drupal\node\NodeGrantDatabaseStorageInterface::writeDefault()
    */
   public function writeDefaultGrant();