Update release note for 7.7.0-preview.3 release

[sdwheeler]

PR Summary

Update release note for 7.7.0-preview.3 release

• Fixes AB#597062

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 contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

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[Copilot]

Pull request overview

Updates PowerShell 7.7 documentation to reflect the 7.7.0-preview.3 release, including the updated runtime baseline and new release-note entries, plus a Windows install guide refresh for the current preview MSIX link.

Changes:

• Bumps the PowerShell 7.7 “What’s New” page to preview.3, including the .NET runtime version and new bullet items.
• Adds/updates reference links for newly mentioned PRs in the 7.7 release notes.
• Updates the Windows install documentation to point to the 7.7.0-preview.3 MSIX bundle.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-77.md	Updates 7.7 preview release notes, adds new entries and reference links.
reference/docs-conceptual/install/install-powershell-on-windows.md	Updates “Current preview” MSIX bundle version and download URL to preview.3.

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[learn-build-service-prod]

Learn Build status updates of commit e19c472:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/install-powershell-on-windows.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-77.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.