Add missing doc blocks to class.wp-(scripts|styles).php.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32566 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class.wp-styles.php

@@ -234,6 +234,9 @@ class WP_Styles extends WP_Dependencies {
 		return false;
 	}
 
+	/**
+	 * @return array
+	 */
 	public function do_footer_items() { // HTML 5 allows styles in the body, grab late enqueued items and output them in the footer.
 		$this->do_items(false, 1);
 		return $this->done;