Update hook docs for add_meta_boxes

Author: opr

src/wp-admin/includes/meta-boxes.php

@@ -1680,7 +1680,7 @@ function register_and_do_post_meta_boxes( $post ) {
 	 * @param string                    $object_type The type of the current object that meta boxes were added to.
 	 *                                               Can be 'post', 'page', custom post types, 'comment', or 'link'.
 	 * @param WP_Post|WP_Comment|object $object      The post, comment, or link object. Type varies depending on
-	 *                                               `$post_type`.
+	 *                                               `$object_type`.
 	 */
 	do_action( 'add_meta_boxes', $post_type, $post );