Revise DFSN cmdlet documentation and add usage notes

[Frafou]

Updated section headers and added notes for cmdlet usage.

PR Summary

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]

PoliCheck Scan Report

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[learn-build-service-prod]

Learn Build status updates of commit b7524cd:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2025-ps/DFSN/DFSN.md	✅Succeeded	View (WindowsServer2025-ps)

For more details, please refer to the build report.

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