Update service_container/factories.rst

Author: OskarStark

service_container/factories.rst

@@ -168,7 +168,7 @@ called to create its object. In this case we don't need a dedicated factory clas
 
             // Note that we are not using service()
             $services->set(NewsletterManager::class)
-                ->factory([NewsletterManager::class, 'create']);
+                ->factory([null, 'create']);
         };
 
 Non-Static Factories