Add the link to the Arm64 MSI download.

[pmsjt]

If there is a template auto-generating these pages, please make sure it is updated so this doesn't get missed again.

PR Summary

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit a66410a:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/Installing-PowerShell-on-Windows.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

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[github-actions]

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[sdwheeler]

Thanks