Ensure the `submitlink_box` action hook is only documented once.

See #26869.

Built from https://develop.svn.wordpress.org/trunk@28210


git-svn-id: http://core.svn.wordpress.org/trunk@28040 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/edit-link-form.php

@@ -118,11 +118,7 @@ wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false ); ?>
 <div id="postbox-container-1" class="postbox-container">
 <?php
 
-/**
- * Fires before the Save meta box in the sidebar.
- *
- * @since 2.5.0
- */
+/** This action is documented in wp-admin/includes/meta-boxes.php */
 do_action( 'submitlink_box' );
 $side_meta_boxes = do_meta_boxes( 'link', 'side', $link );