updating Pod DNS config example to use documentation IP address (#39169)

* updating Pod DNS config example to use documentation IP address

* add this is an example in note

* empty commit

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

@@ -306,7 +306,7 @@ When the Pod above is created, the container `test` gets the following contents
 in its `/etc/resolv.conf` file:
 
 ```
-nameserver 1.2.3.4
+nameserver 192.0.2.1
 search ns1.svc.cluster-domain.example my.dns.search.suffix
 options ndots:2 edns0
 ```

content/en/examples/service/networking/custom-dns.yaml

@@ -10,7 +10,7 @@ spec:
   dnsPolicy: "None"
   dnsConfig:
     nameservers:
-      - 1.2.3.4
+      - 192.0.2.1 # this is an example
     searches:
       - ns1.svc.cluster-domain.example
       - my.dns.search.suffix