[zh] Update kubectl.md

Signed-off-by: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>

content/zh/docs/reference/kubectl/kubectl.md

@@ -488,9 +488,41 @@ kubectl [flags]
   </tbody>
 </table>
 
+## {{% heading "envvars" %}}
 
+<table style="width: 100%; table-layout: fixed;">
+<colgroup>
+<col span="1" style="width: 10px;" />
+<col span="1" />
+</colgroup>
+<tbody>
 
+<tr>
+<td colspan="2">KUBECONFIG</td>
+</tr>
+<tr>
+<td></td><td style="line-height: 130%; word-wrap: break-word;">
+<!--
+Path to the kubectl configuration ("kubeconfig") file. Default: "$HOME/.kube/config"
+-->
+kubectl 的配置 ("kubeconfig") 文件的路径。默认值: "$HOME/.kube/config"
+</td>
+</tr>
 
+<tr>
+<td colspan="2">KUBECTL_COMMAND_HEADERS</td>
+</tr>
+<tr>
+<td></td><td style="line-height: 130%; word-wrap: break-word;">
+<!--
+When set to false, turns off extra HTTP headers detailing invoked kubectl command (Kubernetes version v1.22 or later)
+-->
+设置为 false 时，关闭用于详细说明被调用的 kubectl 命令的额外 HTTP 标头 (Kubernetes 版本为 v1.22 或者更高)
+</td>
+</tr>
+
+</tbody>
+</table>
 
 ## {{% heading "seealso" %}}
 

data/i18n/zh/zh.toml

@@ -49,6 +49,9 @@ other = "我是..."
 [docs_label_users]
 other = "用户"
 
+[envvars_heading]
+other = "环境变量"
+
 [examples_heading]
 other = "示例"