minor #4496 [Book][Security] link to a bundle's current (not master) docs (xabbuh)

This PR was merged into the 2.5 branch.

Discussion
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[Book][Security] link to a bundle's current (not master) docs

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

Commits
-------

ef7495e link to a bundle's current (not master) docs

Author: weaverryan

book/security.rst

@@ -2303,7 +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
+.. _`FrameworkExtraBundle documentation`: http://symfony.com/doc/current/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