docs: hardhat-completion add windows troubleshooting

docs/src/content/hardhat-runner/docs/guides/command-line-completion.md

@@ -61,3 +61,12 @@ If you are using bash, try this:
 - Run `complete -p hh`. You should get `complete -o default -F _hh_completion hh` as the output.
 - Check that your `.bashrc` has a line that loads a `__tabtab.bash` file. This is the file that in turn should load the `hh` completion.
 - Check that this `__tabtab.bash` exists, and that there is a `hh.bash` file in that same directory.
+
+### Windows user
+
+- The `hardhat-completion install` is not supported on Windows.
+- On Windows, the default `hh` command is associated with the HTML Help executable program (Hh.exe). To use `hardhat-completion`, you can simply run `npx hh` instead of `hh`.
+- If you want to set the `hh`command for hardhat-completion as the default on Windows, you can follow these steps:
+  1. Run the `npm config get prefix` to get the npm global packages installation location.
+  2. Add the npm location to the `Path` environment variable. For more information, refer to the [Microsoft document](https://learn.microsoft.com/en-us/previous-versions/office/developer/sharepoint-2010/ee537574(v=office.14))
+  3. You need to set the system environment variable `Path` because the `Hh.exe` is in `%SystemRoot%` environment variable.  Add the npm location to the `Path` before `%SystemRoot%`