migrate.module

<?php


/**
 * @file
 * Provides the Migrate API.
 */
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function migrate_help($route_name, RouteMatchInterface $route_match) {
    switch ($route_name) {
        case 'help.page.migrate':
            $output = '<h3>' . t('About') . '</h3>';
            $output .= '<p>';
            $output .= t('The Migrate module provides a framework for migrating data, usually from an external source into your site. It does not provide a user interface. For more information, see the <a href=":migrate">online documentation for the Migrate module</a>.', [
                ':migrate' => 'https://www.drupal.org/documentation/modules/migrate',
            ]);
            $output .= '</p>';
            return $output;
    }
}