Added IPv6 related displays in DNS document (#6532)

* Added IPv6 info to kube-proxy arguments

* Added IPv6 related printouts for kubectl commands

* revert kube-proxy.md

* revert

* revert to ba7c300

* revert to 08af95d

docs/concepts/services-networking/dns-pod-service.md

@@ -241,6 +241,15 @@ search ns1.svc.cluster.local my.dns.search.suffix
 options ndots:2 edns0
 ```
 
+For IPv6 setup, search path and name server should be setup like this:
+
+```
+$ kubectl exec -it busybox -- cat /etc/resolv.conf
+nameserver fd00:79:30::a
+search default.svc.cluster.local svc.cluster.local cluster.local
+options ndots:5
+```
+
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