Update service_container/factories.rst

Author: OskarStark

service_container/factories.rst

@@ -103,7 +103,6 @@ Using the Class as Factory Itself
 ---------------------------------
 
 When the static factory method is on the same class as the created instance, the class name can be omitted from the factory declaration.
-of the class itself.
 Let's suppose the ``NewsletterManager`` class has a ``create()`` method that needs
 to be called to create the object and need a send email address::