[symfony#3157] Removing one extra variable change

Author: weaverryan

cookbook/form/form_collections.rst

@@ -410,7 +410,7 @@ one example:
  $collectionHolder.data('index', index + 1);
 
  // Display the form in the page in an li, before the "Add a tag" link li
- var $newFormLi = $('<li></li>').append($newForm);
+ var $newFormLi = $('<li></li>').append(newForm);
  $newLinkLi.before($newFormLi);
  }