Coding Standards: Document intentional case block fall-throughs.

Fixes `PSR2.ControlStructures.SwitchDeclaration.TerminatingComment` violations.

See #45934.



git-svn-id: https://develop.svn.wordpress.org/trunk@44565 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/post.php

@@ -205,6 +205,7 @@ switch ( $action ) {
 
 		wp_update_attachment_metadata( $post_id, $newmeta );
 
+		// Intentional fall-through to trigger the edit_post() call.
 	case 'editpost':
 		check_admin_referer( 'update-post_' . $post_id );