Added the correct route name for the hook_help.

Closes #3245800

announcements_feed.module

@@ -14,10 +14,10 @@ use Drupal\Core\Routing\RouteMatchInterface;
  */
 function announcements_feed_help($route_name, RouteMatchInterface $route_match) {
   switch ($route_name) {
-    case 'help.page.announce':
+    case 'help.page.announcements_feed':
       $output = '';
       $output .= '<h3>' . t('About') . '</h3>';
-      $output .= '<p>' . t('Announcements Feed module allows to access announcements from the Drupal.org feed. For more information, see the <a href=":documentation">online documentation for the Announcements Feed module module</a>.', [':documentation' => 'https://www.drupal.org/docs/contributed-modules/announcements-feed']) . '</p>';
+      $output .= '<p>' . t('Announcements Feed module allows to access announcements from the Drupal.org feed. For more information, see the <a href=":documentation">online documentation for the Announcements Feed module</a>.', [':documentation' => 'https://www.drupal.org/docs/contributed-modules/announcements-feed']) . '</p>';
       $output .= '<h3>' . t('Uses') . '</h3>';
       $output .= '<dl><dt>' . t('Accessing announcements') . '</dt>';
       $output .= '<dd>' . t('Click on "Announce" link in Admin menu toolbar to see all the announcements.') . '</dd>';