Update nodelocaldns.md

use ",__PILLAR__DNS__SERVER__" as old pattern instead of "__PILLAR__DNS__SERVER__" when use ipvs mode

Author: likakuli

content/zh/docs/tasks/administer-cluster/nodelocaldns.md

@@ -174,7 +174,7 @@ If you are using the sample manifest from the previous point, this will require
   * If kube-proxy is running in IPVS mode:
 
     ``` bash
-     sed -i "s/__PILLAR__LOCAL__DNS__/$localdns/g; s/__PILLAR__DNS__DOMAIN__/$domain/g; s/__PILLAR__DNS__SERVER__//g; s/__PILLAR__CLUSTER__DNS__/$kubedns/g" nodelocaldns.yaml
+     sed -i "s/__PILLAR__LOCAL__DNS__/$localdns/g; s/__PILLAR__DNS__DOMAIN__/$domain/g; s/,__PILLAR__DNS__SERVER__//g; s/__PILLAR__CLUSTER__DNS__/$kubedns/g" nodelocaldns.yaml
     ```
      In this mode, node-local-dns pods listen only on `<node-local-address>`. The node-local-dns interface cannot bind the kube-dns cluster IP since the interface used for IPVS loadbalancing already uses this address.
      `__PILLAR__UPSTREAM__SERVERS__` will be populated by the node-local-dns pods.