(GH-10822) Clarify UUID version for New-Guid

[michaeltlombardi]

PR Summary

Prior to this change, the documentation for the New-Guid cmdlet did not specify which GUID version the cmdlet creates. This change:

• Adds a note clarifying the cmdlet creates v4 UUIDs.
• Resolves Which Version of UUID is implemented? #10822
• Fixes AB#203150

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 4434714:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Utility/New-Guid.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Utility/New-Guid.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Utility/New-Guid.md	✅Succeeded	View (powershell-7.3)
reference/7.4/Microsoft.PowerShell.Utility/New-Guid.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Utility/New-Guid.md	✅Succeeded	View (powershell-7.5)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel