Fix typo

"private services services"

Author: JarJak

testing.rst

@@ -272,7 +272,7 @@ the container is stored in ``self::$container``::
 
 The container in ``self::$container`` is actually a special test container.
 It gives you access to both the public services and the non-removed
-:ref:`private services <container-public>` services.
+:ref:`private services <container-public>`.
 
 .. note::