bug #4442 replace doc role for bundle docs with external ref (xabbuh)

This PR was submitted for the master branch but it was merged into the 2.5 branch instead (closes #4442).

Discussion
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replace doc role for bundle docs with external ref

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.5+
| Fixed tickets |

Commits
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d27bcc5 replace doc role for bundle docs with external ref

book/security.rst

@@ -1203,8 +1203,7 @@ Thanks to the SensioFrameworkExtraBundle, you can also secure your controller us
         // ...
     }
 
-For more information, see the
-:doc:`FrameworkExtraBundle documentation </bundles/SensioFrameworkExtraBundle/annotations/security>`.
+For more information, see the `FrameworkExtraBundle documentation`_.
 
 Securing other Services
 ~~~~~~~~~~~~~~~~~~~~~~~
@@ -2304,6 +2303,7 @@ Learn more from the Cookbook
 * :doc:`/cookbook/security/remember_me`
 * :doc:`How to Restrict Firewalls to a Specific Request </cookbook/security/firewall_restriction>`
 
+.. _`FrameworkExtraBundle documentation`: http://symfony.com/doc/master/bundles/SensioFrameworkExtraBundle/annotations/security.html
 .. _`FOSUserBundle`: https://github.com/FriendsOfSymfony/FOSUserBundle
 .. _`implement the \Serializable interface`: http://php.net/manual/en/class.serializable.php
 .. _`Timing attack`: http://en.wikipedia.org/wiki/Timing_attack