minor symfony#8317 Update dynamic_form_modification.rst (atailouloute)

This PR was merged into the 2.7 branch.

Discussion
----------

Update dynamic_form_modification.rst

Commits
-------

3032d45 Update dynamic_form_modification.rst

Author: xabbuh

form/dynamic_form_modification.rst

@@ -269,7 +269,7 @@ Customizing the Form Type
 Now that you have all the basics in place you can take advantage of the ``TokenStorageInterface``
 and fill in the listener logic::
 
-    // src/AppBundle/FormType/FriendMessageFormType.php
+    // src/AppBundle/Form/Type/FriendMessageFormType.php
 
     use AppBundle\Entity\User;
     use Doctrine\ORM\EntityRepository;