Fixes #10296 - Document new parameters for New-Guid

[sdwheeler]

PR Summary

Document new parameters for New-Guid

• Fixes AB#153565
• Fixes New-Guid add support for -Empty and -InputObject #10296

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 f77f4e6:

✅ Validation status: passed

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

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