Add link to "imports" doc in services.yaml (#1466)

Author: nicolas-grekas

symfony/framework-bundle/7.4/config/services.yaml

@@ -2,6 +2,7 @@
 
 # This file is the entry point to configure your own services.
 # Files in the packages/ subdirectory configure your dependencies.
+# See also https://symfony.com/doc/current/service_container/import.html
 
 # Put parameters here that don't need to change on each machine where the app is deployed
 # https://symfony.com/doc/current/best_practices.html#use-parameters-for-application-configuration