Updates documentation

docs/clmc-service.md

@@ -181,6 +181,7 @@ with **/clmc-service** so that the nginx reverse proxy server (listening on port
             {
                 "policy": "<TOSCA policy ID>",
                 "trigger": "<TOSCA trigger ID>",
+                "handlers": ["<list of URLs that receive alerts through POST requests>"],
                 "task_identifier": "<Kapacitor task identifier>",
                 "topic_identifier": "<Kapacitor topic identifier>",
                 "task_api_endpoint": "/kapacitor/v1/tasks/<Kapacitor task identifier>",