etc/kamailio.cfg: example for udp_reciever_mode parameter

- version set to 6.0 in header comment

etc/kamailio.cfg

@@ -1,6 +1,6 @@
 #!KAMAILIO
 #
-# Kamailio SIP Server v5.8 - default configuration script
+# Kamailio SIP Server v6.0 - default configuration script
 #     - web: https://www.kamailio.org
 #     - git: https://github.com/kamailio/kamailio
 #
@@ -191,6 +191,13 @@ children=8
 /* number of SIP routing processes for all TCP/TLS sockets */
 # tcp_children=8
 
+/* UDP receiving mode:
+ * - 0: multi-process (defaut)
+ * - 1: multi-threaded with async worker group 'udp'
+ * - 2: per socket configuration (see core cookbook) */
+# async_workers_group="name=udp;workers=8"
+# udp_receiver_mode = 1
+
 /* uncomment the next line to disable the auto discovery of local aliases
  * based on reverse DNS on IPs (default on) */
 # auto_aliases=no