Updating docs to show AAD Server Principals is GA

[dbrownems]

This feature GA'd in 2019

[PRMerger17]

@dbrownems : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[opbld30]

Docs Build status updates of commit 334d8c4:

✅ Validation status: passed

File	Status	Preview URL	Details
azure-sql/managed-instance/sql-managed-instance-paas-overview.md	✅Succeeded

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.

For any questions, please:

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[niko-neugebauer]

#sign-off

[niko-neugebauer]

Approved. Thank you for improving our documentation.

[niko-neugebauer]

#sign-off

[opbld33]

Docs Build status updates of commit 334d8c4:

✅ Validation status: passed

File	Status	Preview URL	Details
azure-sql/managed-instance/sql-managed-instance-paas-overview.md	✅Succeeded

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.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel