Issue #3316813 by immaculatexavier, apaderno, RoSk0: Remove mentions of node_access_example.module from docblocks

(cherry picked from commit d0ab721e3f)

core/modules/node/node.api.php

@@ -63,8 +63,6 @@ use Drupal\Component\Utility\Xss;
  * sure to restore your {node_access} record after node_access_rebuild() is
  * called.
  *
- * For a detailed example, see node_access_example.module.
- *
  * @param \Drupal\Core\Session\AccountInterface $account
  *   The account object whose grants are requested.
  * @param string $op

core/modules/node/node.module

@@ -813,9 +813,6 @@ function node_form_system_themes_admin_form_submit($form, FormStateInterface $fo
  * Note also that access to create nodes is handled by
  * hook_ENTITY_TYPE_create_access().
  *
- * To see how to write a node access module of your own, see
- * node_access_example.module.
- *
  * @see \Drupal\node\NodeAccessControlHandler
  */