Update service_container/factories.rst

Author: OskarStark

service_container/factories.rst

@@ -106,7 +106,7 @@ 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.
 Let's suppose the ``NewsletterManager`` class has a ``create()`` method that needs
-to be called to create the object and need a sender::
+to be called to create the object and needs a sender::
 
     // src/Email/NewsletterManager.php
     namespace App\Email;