Update service_container/service_subscribers_locators.rst

Co-Authored-By: XuruDragon <xurudragon@gmail.com>

Author: OskarStark

service_container/service_subscribers_locators.rst

@@ -444,7 +444,7 @@ but we can now access a specific injected service:
 
 After compilation the ``HandlerCollection`` to retrieve a specific service by it's ``key`` attribute
 from the service locator injected, we just have to do ``$serviceLocator->get('handler_two');`` to
-retrieve the ``handler_two`` handler :
+retrieve the ``handler_two`` handler::
 .. code-block:: php
 
     // src/Handler/HandlerCollection.php