mysql.module

<?php


/**
 * @file
 * The MySQL module provides the connection between Drupal and a MySQL, MariaDB or equivalent database.
 */
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function mysql_help($route_name, RouteMatchInterface $route_match) {
    switch ($route_name) {
        case 'help.page.mysql':
            $output = '';
            $output .= '<h2>' . t('About') . '</h2>';
            $output .= '<p>' . t('The MySQL module provides the connection between Drupal and a MySQL, MariaDB or equivalent database. For more information, see the <a href=":mysql">online documentation for the MySQL module</a>.', [
                ':mysql' => 'https://www.drupal.org/docs/core-modules-and-themes/core-modules/mysql-module',
            ]) . '</p>';
            return $output;
    }
}