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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[github-actions]

@sachin-lalwani
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[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit b522a0a:

✅ 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.