(GH-8443) Update help for the SecurityDescriptorSddl parameter of Set-Service

[michaeltlombardi]

PR Summary

This PR updates the help for the SecurityDescriptorSddl parameter
of Set-Service to clarify the necessary permissions for using it.

• Resolves Doc change related to code changes in Set-Service cmdlet #8443

PR Context

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• Files in docs-conceptual

Cmdlet reference & about_ topics
When changing cmdlet reference or about_ topics, the changes should be copied to all
relevant versions. Check the boxes below to indicate the versions affected by this change.

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• Version 7.2 content
• Version 7.1 content
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[opbld31]

Docs Build status updates of commit 87c501d:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.3/Microsoft.PowerShell.Management/Set-Service.md	✅Succeeded	View (powershell-7.3)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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