docs: hardhat-completion add windows troubleshooting

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

@@ -61,3 +61,17 @@ 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
+
+`hardhat-shorthand` doesn't work well by default on Windows. Please read this to learn why and how to improve it.
+
+On Windows, the default `hh` command is associated with the HTML Help executable program (hh.exe). To use `hardhat-shorthand`, you can simply run `npx hh` instead of `hh`, but that won't work well with its autocompletion.
+
+If you want to use `hh` on Windows, you can follow these steps:
+
+1. Run `npm config get prefix` to get the npm global packages installation location.
+
+2. Add the npm location to the `Path` environment variable.
+
+3. Make sure to add the npm location to `Path` before `%SystemRoot%` because default `hh.exe` is in `%SystemRoot%`, and it will take precedence over `hh-shorthand` otherwise.