Merge pull request #48052 from my-git9/pp-28505

[zh-cn]sync kubeadm/_index.md

content/zh-cn/docs/tasks/administer-cluster/kubeadm/_index.md

@@ -1,4 +1,20 @@
 ---
 title: "用 kubeadm 进行管理"
 weight: 10
+simple_list: true
 ---
+<!--
+title: "Administration with kubeadm"
+weight: 10
+simple_list: true
+-->
+
+<!--
+If you don't yet have a cluster, visit
+[bootstrapping clusters with `kubeadm`](/docs/setup/production-environment/tools/kubeadm/).
+
+The tasks in this section are aimed at people administering an existing cluster:
+-->
+如果你还没有集群，请访问[使用 `kubeadm` 引导集群](/zh-cn/docs/setup/production-environment/tools/kubeadm/)。
+
+本节中的任务适用于管理现有集群的人员：