Update service_container/service_closures.rst

Co-authored-by: Jacob Dreesen <jacob@hdreesen.de>

Author: HypeMC

service_container/service_closures.rst

@@ -94,7 +94,7 @@ argument of type ``service_closure``:
 .. seealso::
 
     Another way to inject services lazily is via a
-    :doc:`service locators </service_container/service_subscribers_locators>`.
+    :doc:`service locator </service_container/service_subscribers_locators>`.
 
 Using a Service Closure in a Compiler Pass
 -------------------------------------------