[zh] Resync kubeadm files (3)

content/zh/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade.md

@@ -585,10 +585,10 @@ and post-upgrade manifest file for a certain component, a backup file for it wil
 - Makes sure the control plane images are available or available to pull to the machine.
 - Generates replacements and/or uses user supplied overwrites if component configs require version upgrades.
 - Upgrades the control plane components or rollbacks if any of them fails to come up.
-- Applies the new `kube-dns` and `kube-proxy` manifests and makes sure that all necessary RBAC rules are created.
+- Applies the new `CoreDNS` and `kube-proxy` manifests and makes sure that all necessary RBAC rules are created.
 - Creates new certificate and key files of the API server and backs up old files if they're about to expire in 180 days.
 -->
-## 工作原理
+## 工作原理   {#how-it-works}
 
 `kubeadm upgrade apply` 做了以下工作：
 
@@ -600,7 +600,7 @@ and post-upgrade manifest file for a certain component, a backup file for it wil
 - 确保控制面的镜像是可用的或可拉取到服务器上。
 - 如果组件配置要求版本升级，则生成替代配置与/或使用用户提供的覆盖版本配置。
 - 升级控制面组件或回滚（如果其中任何一个组件无法启动）。
-- 应用新的 `kube-dns` 和 `kube-proxy` 清单，并强制创建所有必需的 RBAC 规则。
+- 应用新的 `CoreDNS` 和 `kube-proxy` 清单，并强制创建所有必需的 RBAC 规则。
 - 如果旧文件在 180 天后过期，将创建 API 服务器的新证书和密钥文件并备份旧文件。
 
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