Issue #2533756 by quietone, jhodgdon, xjm: Revisit large numbers of @see in text element docs

 * - #pattern: A string for the native HTML5 pattern attribute.

 *

 * Usage example:

 *

 * @code

 * $form['title'] = [

 *   '#type' => 'textfield',

 * ];

 * @endcode

 *

 * @see \Drupal\Core\Render\Element\Color

 * @see \Drupal\Core\Render\Element\Email

 * @see \Drupal\Core\Render\Element\MachineName

 * @see \Drupal\Core\Render\Element\Number

 * @see \Drupal\Core\Render\Element\Password

 * @see \Drupal\Core\Render\Element\PasswordConfirm

 * @see \Drupal\Core\Render\Element\Range

 * @see \Drupal\Core\Render\Element\Tel

 * @see \Drupal\Core\Render\Element\Url

 * @see \Drupal\Core\Render\Element

 * @see \Drupal\Core\Render\Element\Textarea

 */

#[FormElement('textfield')]

class Textfield extends FormElementBase {