Update nodelocaldns.md

 Resolve `sed` error commands in the IPVS mode.

Author: ZhangJinbao520

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

@@ -108,7 +108,7 @@ This feature can be enabled using the following steps:
   * 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, the `node-local-dns` pods listen only on `<node-local-address>`.