help_topics.module

<?php


/**
 * @file
 * Displays help topics provided by modules and themes.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Url;

/**
 * Implements hook_help().
 */
function help_topics_help($route_name, RouteMatchInterface $route_match) {
  if ($route_name == 'help.page.help_topics') {
    $help_home = Url::fromRoute('help.main')->toString();
    $output = '<h2>' . t('About') . '</h2>';
    $output .= '<p>' . t('The Help Topics module has been moved to the Help module.') . '</p>';
    $output .= '<p>' . t('See the <a href=":help_page">Help page</a> to view topics.', [
      ':help_page' => $help_home,
    ]) . '</p>';
    return [
      '#markup' => $output,
    ];
  }
}