Update form_customization.rst

In the Form chapter of Book for Symphony 2.3, we use '{{ form(form) }}' to render the entire form ( in contrast to '{{ form_widget(form) }}' for older version of Symfony ). so maybe it should use '{{ form(form) }}' here for consistency.

Author: oopsFrogs

cookbook/form/form_customization.rst

@@ -67,7 +67,7 @@ just one line:
 
     .. code-block:: jinja
 
-        {{ form_widget(form) }}
+        {{ form(form) }}
 
     .. code-block:: php