For #1110, Refine conf

Author: winlinvip

trunk/conf/full.conf

@@ -723,7 +723,7 @@ vhost hooks.callback.srs.com {
         #           "action": "on_publish",
         #           "client_id": 1985,
         #           "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
-        #           "stream": "livestream"
+        #           "stream": "livestream", "param":"?token=xxx&salt=yyy"
         #       }
         # if valid, the hook must return HTTP code 200(Stauts OK) and response
         # an int value specifies the error code(0 corresponding to success):