Minor reword

Author: javiereguiluz

session.rst

@@ -135,10 +135,9 @@ Check out the Symfony config reference to learn more about the other available
 Basic Usage
 -----------
 
-The session is available through ``->getSession()`` from the ``Request`` and the ``RequestStack``.
-Symfony provides a request_stack service that is injected in your services and
-controllers if you type-hint an argument with
-:class:`Symfony\\Component\\HttpFoundation\\RequestStack`::
+The session is available through the ``Request`` object and the ``RequestStack``
+service. Symfony injects the ``request_stack`` service in services and controllers
+if you type-hint an argument with :class:`Symfony\\Component\\HttpFoundation\\RequestStack`::
 
     use Symfony\Component\HttpFoundation\RequestStack;