Fix white spaces in the previous commit

Author: sebastianblum

book/forms.rst

@@ -423,7 +423,7 @@ corresponding errors printed out with the form.
     .. code-block:: html+jinja
 
        {# src/Acme/DemoBundle/Resources/views/Default/new.html.twig #}
-       {{ form(form, { 'attr': {'novalidate': 'novalidate' }}) }}
+       {{ form(form, {'attr': {'novalidate': 'novalidate'}}) }}
 
 Validation is a very powerful feature of Symfony2 and has its own
 :doc:`dedicated chapter </book/validation>`.