Updates docs to reflect on the validation for sfc_id

docs/clmc-service.md

@@ -91,6 +91,8 @@ All source code, tests and configuration files of the service can be found in th
         
         Returns a 400 Bad Request error if the request URL parameters are invalid or missing.
         
+        Returns a 400 Bad Request error if the service function chain instance ID is not in the format <sfcID>_<numberID>
+        
    * Response Body Example: 
     
         ```json