[zh-cn] sync mysql-statefulset kubeadm-join kubernetes-api

Signed-off-by: xin.li <[email protected]>

Author: my-git9

content/zh-cn/docs/concepts/overview/kubernetes-api.md

@@ -194,7 +194,7 @@ are provided in the following format:
     }
 }
 ```
-<!-- for editors: intionally use yaml instead of json here, to prevent syntax highlight error. -->
+<!-- for editors: intentionally use yaml instead of json here, to prevent syntax highlight error. -->
 
 <!-- 
 The relative URLs are pointing to immutable OpenAPI descriptions, in

content/zh-cn/docs/reference/setup-tools/kubeadm/kubeadm-join.md

@@ -409,7 +409,8 @@ After that, `kubeadm join` will block until the admin has manually approved the
    ```
 
 <!--
-2. `kubectl certificate approve` allows the admin to approve CSR. This action tells a certificate signing controller to issue a certificate to the requestor with the attributes requested in the CSR.
+2. `kubectl certificate approve` allows the admin to approve CSR. This action tells a certificate signing
+  controller to issue a certificate to the requestor with the attributes requested in the CSR.
 -->
 2. `kubectl certificate approve` 允许管理员批准 CSR。
    此操作告知证书签名控制器向请求者颁发一个证书，该证书具有 CSR 中所请求的那些属性。
@@ -540,10 +541,10 @@ allowed in some cases.
 
 <!--
 The default configuration can be printed out using the
-[kubeadm config print](/docs/reference/setup-tools/kubeadm/kubeadm-config/) command.
+[kubeadm config print](/docs/reference/setup-tools/kubeadm/kubeadm-config/#cmd-config-print) command.
 
 If your configuration is not using the latest version it is **recommended** that you migrate using
-the [kubeadm config migrate](/docs/reference/setup-tools/kubeadm/kubeadm-config/) command.
+the [kubeadm config migrate](/docs/reference/setup-tools/kubeadm/kubeadm-config/#cmd-config-migrate) command.
 -->
 使用 [kubeadm config print](/zh-cn/docs/reference/setup-tools/kubeadm/kubeadm-config/#cmd-config-print)
 命令可以打印默认配置。

content/zh-cn/examples/application/mysql/mysql-statefulset.yaml

@@ -24,7 +24,7 @@ spec:
         - |
           set -ex
           # 基于 Pod 序号生成 MySQL 服务器的 ID。
-          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
+          [[ $HOSTNAME =~ -([0-9]+)$ ]] || exit 1
           ordinal=${BASH_REMATCH[1]}
           echo [mysqld] > /mnt/conf.d/server-id.cnf
           # 添加偏移量以避免使用 server-id=0 这一保留值。