Wrong hook reference in SystemHooks.php

Problem/Motivation

While working on #3445150: Add validation constraints to core.entity_view_mode.*.* I notices something weird.

 /**
   * Implements hook_entity_form_mode_presave().
   *
   * Transforms empty description into null.
   */
  #[Hook('hook_entity_form_mode_presave')]
  public function systemEntityFormModePresave(EntityInterface $entity): void {
    if ($entity->get('description') !== NULL && trim($entity->get('description')) === '') {
      @trigger_error("Setting description to an empty string is deprecated in drupal:11.2.0 and it must be null in drupal:12.0.0. See https://www.drupal.org/node/3452144", E_USER_DEPRECATED);
      $entity->set('description', NULL);
    }
  }

}

This reference seems wrong. This seems pretty important to get in, since it is not triggering now, which will make config invalid for d12 when it is slated for removal.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet