minor #3867 fixed missing info about FosUserBundle. (aitboudad)

This PR was merged into the 2.3 branch.

Discussion
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fixed missing info about FosUserBundle.

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

Commits
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48e8ba7 fixed missing info about FosUserBundle.

Author: weaverryan

book/security.rst

@@ -1135,7 +1135,7 @@ this by creating a ``User`` class and configuring the ``entity`` provider.
 .. tip::
 
     A high-quality open source bundle is available that allows your users
-    to be stored via the Doctrine ORM or ODM. Read more about the `FOSUserBundle`_
+    to be stored in a database. Read more about the `FOSUserBundle`_
     on GitHub.
 
 With this approach, you'll first create your own ``User`` class, which will