better help msg

src/mod/applications/mod_conference/mod_conference.c

@@ -6347,7 +6347,7 @@ static api_command_t conf_api_sub_commands[] = {
 	{"pin", (void_fn_t) & conf_api_sub_pin, CONF_API_SUB_ARGS_SPLIT, "pin", "<pin#>"},
 	{"nopin", (void_fn_t) & conf_api_sub_pin, CONF_API_SUB_ARGS_SPLIT, "nopin", ""},
 	{"get", (void_fn_t) & conf_api_sub_get, CONF_API_SUB_ARGS_SPLIT, "get", "<parameter-name>"},
-	{"set", (void_fn_t) & conf_api_sub_set, CONF_API_SUB_ARGS_SPLIT, "set", "<parameter-name> <value>"},
+	{"set", (void_fn_t) & conf_api_sub_set, CONF_API_SUB_ARGS_SPLIT, "set", "<max_members|sound_prefix|caller_id_name|caller_id_number|endconf_grace_time> <value>"},
 	{"floor", (void_fn_t) & conf_api_sub_floor, CONF_API_SUB_MEMBER_TARGET, "floor", "<member_id|last>"},
 	{"enforce_floor", (void_fn_t) & conf_api_sub_enforce_floor, CONF_API_SUB_MEMBER_TARGET, "enforce_floor", "<member_id|last>"},
 };