correct doc string

src/core/js/form_panel.js

@@ -65,7 +65,8 @@ var form_panel = new function () {
     };
 
     /**
-     * Creates a callback function that toggles the form panel which
+     * Creates a callback function that creates the form inside 
+     * the form panel when called for the first time.
      *
      * You may supply 'undefined' as form_config and use form_creator
      * instead which is supposed to be a function without argument that