Update security.rst

Fixing symfony#13424 (review)

Author: ThomasLandauer

reference/configuration/security.rst

@@ -534,7 +534,7 @@ required by the :class:`Symfony\\Component\\Security\\Core\\User\\UserInterface`
 **type**: ``string`` **default**: ``/logout``
 
 The path which triggers logout. If you change it from the default value ``/logout``,
-aou need to set up a route with a matching path.
+you need to set up a route with a matching path.
 
 ``success_handler``
 ~~~~~~~~~~~~~~~~~~~