Update New-ADServiceAccount.md

[GC-MSFT]

Modified the Synopsis for clarity.

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[bot]]

Learn Build status updates of commit a2f6854:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
docset/winserver2025-ps/activedirectory/New-ADServiceAccount.md	:white_check_mark:Succeeded	View (WindowsServer2025-ps)

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