updated sr-users mailing list address for git install guide

kamailio-install-guide-git/docs/index.md

@@ -392,7 +392,7 @@ to the public GIT in no time.
 Questions about how to use Kamailio and the content of kamailio.cfg can be
 addressed via email to:
 
-  * [sr-users@lists.sip-router.org](http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users)
+  * [sr-users@lists.kamailio.org](http://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users)
 
 More documentation resources can be found at: