Fixup: use correct which command instead of non-existent where

Author: Katee

content/en/docs/tasks/tools/install-kubectl-macos.md

@@ -296,7 +296,7 @@ Depending on how you installed `kubectl`, use one of the following methods.
 1.  Locate the `kubectl` binary on your system:
 
     ```bash
-    where kubectl
+    which kubectl
     ```
 
 1.  Remove the `kubectl` binary:

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
-   where kubectl
+   which kubectl
    ```
 
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