Add FAQ for WinPS5.1 update message

[sdwheeler]

PR Summary

Add FAQ for WinPS5.1 update message

• Fixes AB#546934

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.

[Copilot]

Pull request overview

This PR adds a new FAQ document to explain the Windows PowerShell 5.1 update notification message that users see when starting Windows PowerShell. The FAQ addresses common questions about the message, the relationship between Windows PowerShell 5.1 and PowerShell 7, and provides guidance on updating and installation.

Changes:

• Added new FAQ documentation file explaining the Windows PowerShell update notification message
• Added corresponding screenshot image of the update notification
• Updated table of contents to include the new FAQ page

Reviewed changes

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

File	Description
reference/docs-conceptual/windows-powershell/update-notification-message.yml	New FAQ document explaining the update notification message with Q&A sections
reference/docs-conceptual/windows-powershell/media/update-notification-message/windows-powershell-update-notice.png	Screenshot image showing the update notification message
reference/docs-conceptual/toc.yml	Added navigation entry for the new FAQ page under Windows PowerShell/ISE section

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[michaeltlombardi]

Approved with a single minor nit.

[learn-build-service-prod]

Learn Build status updates of commit 956bebd:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/windows-powershell/media/update-notification-message/windows-powershell-update-notice.png	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/windows-powershell/update-notification-message.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.