Issue #2091379 by amitgoyal, greggmarshall, petrpo, rootwork,...

  switch ($route_name) {

    case 'help.page.toolbar':

      $output = '<h3>' . t('About') . '</h3>';

      $output .= '<p>' . t('The Toolbar module displays links to top-level administration menu items and links from other modules at the top of the screen. For more information, see the online handbook entry for <a href="@toolbar">Toolbar module</a>.', array('@toolbar' => 'http://drupal.org/documentation/modules/toolbar')) . '</p>';

      $output .= '<h3>' . t('Uses') . '</h3>';

      $output .= '<p>' . t('The Toolbar module provides a toolbar for site administrators, which displays tabs and trays provided by the Toolbar module itself and other modules. For more information, see the <a href="!toolbar_docs">online documentation for the Toolbar module</a>.', array('!toolbar_docs' => 'https://drupal.org/documentation/modules/toolbar')) . '</p>';

      $output .= '<h4>' . t('Terminology') . '</h4>';

      $output .= '<dl>';

      $output .= '<dt>' . t('Displaying administrative links') . '</dt>';

      $output .= '<dd>' . t('The Toolbar module displays a bar containing top-level administrative components across the top of the screen. Below that, the Toolbar module has a <em>drawer</em> section where it displays links provided by other modules, such as the core <a href="@shortcuts-help">Shortcut module</a>. The drawer can be hidden/shown by clicking on its corresponding tab.', array('@shortcuts-help' => \Drupal::url('help.page', ['name' => 'shortcut']))) . '</dd>';

      $output .= '<dt>' . t('Tabs') . '</dt>';

      $output .= '<dd>' . t('Tabs are buttons, displayed in a bar across the top of the screen. Some tabs execute an action (such as starting Edit mode), while other tabs toggle which tray is open.') . '</dd>';

      $output .= '<dt>' . t('Trays') . '</dt>';

      $output .= '<dd>' . t('Trays are usually lists of links, which can be hierarchical like a menu. If a tray has been toggled open, it is displayed either vertically or horizontally below the tab bar, depending on the browser width. Only one tray may be open at a time. If you click another tab, that tray will replace the tray being displayed. In wide browser widths, the user has the ability to toggle from vertical to horizontal, using a link at the bottom or right of the tray. Hierarchical menus only have open/close behavior in vertical mode; if you display a tray containing a hierarchical menu horizontally, only the top-level links will be available.') . '</dd>';

      $output .= '</dl>';

      return $output;

  }