twig_tweak/twig_tweak.module

<?php

/**
 * @file
 * Primary module hooks for Twig Tweak module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Implements hook_help().
 */
function twig_tweak_help($route_name, RouteMatchInterface $route_match) {
  if ($route_name == 'help.page.twig_tweak') {
    $output = '';
    $output .= '<h3>' . (string) new TranslatableMarkup('About') . '</h3>';
    $output .= '<p>' . (string) new TranslatableMarkup('Twig Tweak is a small module which provides a Twig extension with some useful functions and filters that can improve development experience.') . '</p>';
    $output .= '<p>' . (string) new TranslatableMarkup('You can click on the links below for more information about this module.') . '<p>';
    $output .= '<p>' . (string) new TranslatableMarkup('<a href=":project_link">Project page</a>', [
      ':project_link' => 'https://www.drupal.org/project/twig_tweak',
    ]) . '<p>';
    return $output;
  }
}