[zh] Sync kubeadm certs command reference

The alpha certs command has graduated into GA in 1.20. This PR updates
the zh localization for `kubeadm certs` command.

content/zh/docs/reference/setup-tools/kubeadm/generated/kubeadm_certs.md

@@ -0,0 +1,58 @@
+
+<!--
+### Synopsis
+-->
+### 概要
+
+<!--
+Commands related to handling kubernetes certificates
+-->
+与处理 kubernetes 证书相关的命令
+
+<!--
+### Options
+-->
+### 选项
+
+   <table style="width: 100%; table-layout: fixed;">
+<colgroup>
+<col span="1" style="width: 10px;" />
+<col span="1" />
+</colgroup>
+<tbody>
+
+<tr>
+<td colspan="2">-h, --help</td>
+</tr>
+<tr>
+<!-- td></td><td style="line-height: 130%; word-wrap: break-word;">help for certs</td -->
+<td></td><td style="line-height: 130%; word-wrap: break-word;"><!-- help for certs-->certs 命令的帮助</td>
+</tr>
+
+</tbody>
+</table>
+
+<!--
+### Options inherited from parent commands
+-->
+### 继承于父命令的选项
+
+   <table style="width: 100%; table-layout: fixed;">
+<colgroup>
+<col span="1" style="width: 10px;" />
+<col span="1" />
+</colgroup>
+<tbody>
+
+<tr>
+<td colspan="2">--rootfs string</td>
+</tr>
+<tr>
+<!-- td></td><td style="line-height: 130%; word-wrap: break-word;">[EXPERIMENTAL] The path to the 'real' host root filesystem.</td -->
+<td></td><td style="line-height: 130%; word-wrap: break-word;">[实验] 到'真实'主机根文件系统的路径。</td>
+</tr>
+
+</tbody>
+</table>
+
+