Revert change to zh-cn

Author: Katee

content/zh-cn/docs/tasks/tools/install-kubectl-macos.md

@@ -468,7 +468,7 @@ Depending on how you installed `kubectl`, use one of the following methods.
 1. 找到你系统上的 `kubectl` 可执行文件：
 
    ```bash
-   which kubectl
+   where kubectl
    ```
 
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