normalize versionadded wording

reference/configuration/framework.rst

@@ -1519,7 +1519,7 @@ name_converter
 **type**: ``string``
 
 .. versionadded:: 2.8
-    The ``name_converter`` setting was introduced in Symfony 2.8.
+    The ``name_converter`` option was introduced in Symfony 2.8.
 
 The name converter to use.
 The :class:`Symfony\\Component\\Serializer\\NameConverter\\CamelCaseToSnakeCaseNameConverter`

service_container/alias_private.rst

@@ -134,7 +134,7 @@ Deprecating Services
 --------------------
 
 .. versionadded:: 2.8
-    The ``deprecated`` setting was introduced in Symfony 2.8.
+    The ``deprecated`` option was introduced in Symfony 2.8.
 
 Once you have decided to deprecate the use of a service (because it is outdated
 or you decided not to maintain it anymore), you can deprecate its definition:

service_container/shared.rst

@@ -5,8 +5,8 @@ How to Define Non Shared Services
 =================================
 
 .. versionadded:: 2.8
-    The ``shared`` setting was introduced in Symfony 2.8. Prior to Symfony 2.8,
-    you had to use the ``prototype`` scope.
+    The ``shared`` option was introduced in Symfony 2.8. Prior to Symfony
+    2.8, you had to use the ``prototype`` scope.
 
 In the service container, all services are shared by default. This means that
 each time you retrieve the service, you'll get the *same* instance. This is