Enhance Add-SPServerScaleOutDatabase documentation

[stefangossner]

Added DatabaseServerCertificateHostName parameter to Add-SPServerScaleOutDatabase cmdlet documentation, specifying its purpose and requirements.

[learn-build-service-prod]

PoliCheck Scan Report

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[learn-build-service-prod]

Learn Build status updates of commit 35c93a0:

✅ Validation status: passed

File	Status	Preview URL	Details
sharepoint/sharepoint-server-ps/SharePointServer/Add-SPServerScaleOutDatabase.md	✅Succeeded	View (sharepoint-server-ps)

For more details, please refer to the build report.

[stefangossner]

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