adding use statement

weaverryan · weaverryan · commit 5c30db4af0fb · 2015-06-28T12:29:06.000-04:00
diff --git a/cookbook/form/data_transformers.rst b/cookbook/form/data_transformers.rst
@@ -60,6 +60,7 @@ class::
     // src/AppBundle/Form/TaskType.php
 
     use Symfony\Component\Form\CallbackTransformer;
+    use Symfony\Component\Form\FormBuilderInterface;
     // ...
 
     class TaskType extends AbstractType
