HelpTopicPluginController.php

<?php

namespace Drupal\help_topics\Controller;

use Drupal\help\Controller\HelpTopicPluginController as CoreHelpTopicPluginController;

/**
 * Controller for help topic plugins.
 *
 * @internal
 *   Help Topic is currently experimental and should only be leveraged by
 *   experimental modules and development releases of contributed modules.
 *   See https://www.drupal.org/core/experimental for more information.
 */
class HelpTopicPluginController extends CoreHelpTopicPluginController {

}