Make module handle its own exit (#50728)

docs/docsite/rst/dev_guide/developing_modules_general.rst

@@ -156,7 +156,7 @@ To create a new module:
         # want to make any changes to the environment, just return the current
         # state with no modifications
         if module.check_mode:
-            return result
+            module.exit_json(**result)
 
         # manipulate or modify the state as needed (this is going to be the
         # part where your module will do what it needs to do)