Fix heading level in form_login_setup.rst

Author: xelaris

cookbook/security/form_login_setup.rst

@@ -318,7 +318,7 @@ see :doc:`/cookbook/security/form_login`.
 .. _book-security-common-pitfalls:
 
 Avoid common Pitfalls
-=====================
+---------------------
 
 When setting up your login form, watch out for a few common pitfalls.
 
@@ -471,4 +471,4 @@ any firewall. This means you can't check for security or even access the
 user object on these pages. See :doc:`/cookbook/controller/error_pages`
 for more details.
 
-.. _`FOSUserBundle`: https://github.com/FriendsOfSymfony/FOSUserBundle
+.. _`FOSUserBundle`: https://github.com/FriendsOfSymfony/FOSUserBundle