Docs: Remove @return void from various DocBlocks.

Per the documentation standards, it should not be used outside of the default bundled themes.

Follow-up to [52049], [52051], [53331], [54156], [54214], [55203], [55719].

See #57840.

git-svn-id: https://develop.svn.wordpress.org/trunk@55725 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-controller.php

@@ -34,8 +34,6 @@ class WP_REST_Global_Styles_Controller extends WP_REST_Controller {
 	 * Registers the controllers routes.
 	 *
 	 * @since 5.9.0
-	 *
-	 * @return void
 	 */
 	public function register_routes() {
 		register_rest_route(