minor #5132 [Components][DependencyInjection] fix wrong disable of factories (sstok)

This PR was merged into the 2.6 branch.

Discussion
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[Components][DependencyInjection] fix wrong disable of factories

Move the `versionadded` below the description to fix the rendering.
See http://symfony.com/doc/current/components/dependency_injection/factories.html there is a big whitespace gap.

![symfony-doc-misrendering](https://cloud.githubusercontent.com/assets/904790/6941202/f78dae26-d87d-11e4-944d-ddce95e121e7.png)

Commits
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ca3eb9b Update factories.rst

Author: wouterj

components/dependency_injection/factories.rst

@@ -4,11 +4,6 @@
 Using a Factory to Create Services
 ==================================
 
-.. versionadded:: 2.6
-    The new :method:`Symfony\\Component\\DependencyInjection\\Definition::setFactory`
-    method was introduced in Symfony 2.6. Refer to older versions for the
-    syntax for factories prior to 2.6.
-
 Symfony's Service Container provides a powerful way of controlling the
 creation of objects, allowing you to specify arguments passed to the constructor
 as well as calling methods and setting parameters. Sometimes, however, this
@@ -17,6 +12,11 @@ For this situation, you can use a factory to create the object and tell the
 service container to call a method on the factory rather than directly instantiating
 the class.
 
+.. versionadded:: 2.6
+    The new :method:`Symfony\\Component\\DependencyInjection\\Definition::setFactory`
+    method was introduced in Symfony 2.6. Refer to older versions for the
+    syntax for factories prior to 2.6.
+
 Suppose you have a factory that configures and returns a new ``NewsletterManager``
 object::