Add PHPCS ignore comment for translation domain

Added a phpcs:ignore comment to suppress missing translation domain warning in get_planet_feed_url, clarifying that the WP Core translation is being used intentionally.

Author: pfefferle

includes/adapters/class-wordpress.php

@@ -218,6 +218,7 @@ protected function get_news_feed_url() {
 	 */
 	protected function get_planet_feed_url() {
 		// Translators: Link to the Planet feed of the locale.
+		// phpcs:ignore WordPress.WP.I18n.MissingArgDomainDefault -- Using WP Core translation.
 		return \__( 'https://planet.wordpress.org/feed/' );
 	}