materio-d8/web/modules/custom/user_block/user_block.module

<?php

/**
 * @file
 * Contains user_block.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
// function user_block_help($route_name, RouteMatchInterface $route_match) {
//   switch ($route_name) {
//     // Main module help for the user_block module.
//     case 'help.page.user_block':
//       $output = '';
//       $output .= '<h3>' . t('About') . '</h3>';
//       $output .= '<p>' . t('Provide a block with user name/email and logout link') . '</p>';
//       return $output;
//
//     default:
//   }
// }