Merge pull request #24244 from rwrr/master

Fix typo

Author: k8s-ci-robot

content/zh/docs/tasks/administer-cluster/dns-custom-nameservers.md

@@ -220,7 +220,7 @@ You can modify the default CoreDNS behavior by modifying the ConfigMap.
 
 CoreDNS has the ability to configure stubdomains and upstream nameservers using the [forward plugin](https://coredns.io/plugins/forward/).
 -->
-### 使用 CoreDN 配置存根域和上游域名服务器
+### 使用 CoreDNS 配置存根域和上游域名服务器
 
 CoreDNS 能够使用 [forward 插件](https://coredns.io/plugins/forward/)配置存根域和上游域名服务器。