Fixing missed reference

Author: weaverryan

book/forms.rst

@@ -1192,5 +1192,5 @@ Learn more from the Cookbook
 
 .. _`Symfony2 Form Component`: https://github.com/symfony/Form
 .. _`Twig Bridge`: https://github.com/symfony/symfony/tree/master/src/Symfony/Bridge/Twig
-.. _`div_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
+.. _`form_div_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
 .. _`Cross-site request forgery`: http://en.wikipedia.org/wiki/Cross-site_request_forgery