Fixes #12757 - Clarify that WinPS5.1 and PS7 are different products

[sdwheeler]

PR Summary

Clarify that WinPS5.1 and PS7 are different products

• Fixes AB#553150
• Fixes Four crucial characters missing from Powershell "upgrade message" page #12757

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

This PR clarifies the distinction between Windows PowerShell 5.1 and PowerShell 7 in the update notification message FAQ documentation, addressing user confusion reported in issue #12757. The issue raised concerns about an ambiguous statement that could be misinterpreted to mean PowerShell in general (including PowerShell 7) is no longer being developed.

Changes:

• Updated the document modification date to reflect the current revision
• Added explicit statement that PowerShell 7 and Windows PowerShell 5.1 are separate products
• Clarified that specifically Windows PowerShell 5.1 (not PowerShell in general) is no longer being developed

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[learn-build-service-prod]

Learn Build status updates of commit f75f218:

✅ Validation status: passed

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

For more details, please refer to the build report.