Issue #3414920 by quietone, m0d: Fix documentation redirects to Drupal 7 docs

   See INSTALL.txt and UPDATE.txt in the "core" directory.

 * Learn about how to use Drupal to create your site:

   https://www.drupal.org/documentation

 * Follow best practices:

   https://www.drupal.org/best-practices

 * Download contributed modules to /modules to extend Drupal's functionality:

   https://www.drupal.org/project/project_module

 * See also: "Developing for Drupal" for writing your own modules, below.

 *

 * WARNING: The above defaults are designed for database portability. Changing

 * them may cause unexpected behavior, including potential data loss. See

 * https://www.drupal.org/developing/api/database/configuration for more

 * information on these defaults and the potential issues.

 * https://www.drupal.org/docs/8/api/database-api/database-configuration for

 * more information on these defaults and the potential issues.

 *

 * More details can be found in the constructor methods for each driver:

 * - \Drupal\mysql\Driver\Database\mysql\Connection::__construct()

 *

 * @see default.settings.php

 * @see \Drupal\Core\DrupalKernel::getSitePath()

 * @see https://www.drupal.org/documentation/install/multi-site

 * @see https://www.drupal.org/docs/getting-started/multisite-drupal

 */

 * Ideally, all code that is included in Drupal Core and contributed modules,

 * themes, and distributions will be secure, internationalized, maintainable,

 * and efficient. In order to facilitate this, the Drupal community has

 * developed a set of guidelines and standards for developers to follow. Most of

 * these standards can be found under

 * @link https://www.drupal.org/developing/best-practices Best practices on Drupal.org @endlink

 * developed a set of guidelines and standards for developers to follow.

 *

 * Standards and best practices that developers should be aware of include:

 * - Security: https://www.drupal.org/writing-secure-code and the

 * mysqli or oci8.

 *

 * For more detailed information on the database abstraction layer, see

 * https://www.drupal.org/docs/8/api/database-api/database-api-overview.

 * https://www.drupal.org/docs/drupal-apis/database-api/database-api-overview.

 *

 * @section sec_entity Querying entities

 * Any query on Drupal entities or fields should use the Entity Query API. See

 *

 * There are also methods to join to other tables, add fields with aliases,

 * isNull() to query for NULL values, etc. See

 * https://www.drupal.org/developing/api/database for many more details.

 * https://www.drupal.org/docs/drupal-apis/database-api for many more details.

 *

 * One note on chaining: It is common in the dynamic database API to chain

 * method calls (as illustrated here), because most of the query methods modify

 * if you had a connection object variable $connection available to use. See

 * also the @link container Services and Dependency Injection topic. @endlink

 *

 * @see https://www.drupal.org/developing/api/database

 * @see https://www.drupal.org/docs/drupal-apis/database-api

 * @see entity_api

 * @see schemaapi

 *