docs: hardhat-completion add windows troubleshooting

[iosh]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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Add Windows troubleshooting to hardhat-shorthand, resolve #5040

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2024 7:44am

[iosh]

I noticed that @fvictorio/tabtab doesn't support Windows. After some searching, I found the following information on supporting completion with a PowerShell script for Windows.

• https://gist.github.com/jcwillox/027b6c105d190abfa0333c13836f5bec
• https://github.com/spf13/cobra/blob/main/powershell_completions.go