Update site-server-high-availability.md

[PanuSaukko]

Need to add more info what to do with SMS Provider role after you have uninstalled the passive site server.

[prmerger-automator]

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

[learn-build-service-prod]

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[JohanFreelancer9]

Copy review - @PanuSaukko, kindly commit the suggested changes. Many thanks.

[PanuSaukko]

Good improvements! Thank you!

[learn-build-service-prod]

Learn Build status updates of commit 5bd9f6a:

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[learn-build-service-prod]

Learn Build status updates of commit 82b7ca7:

✅ Validation status: passed

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memdocs/configmgr/core/servers/deploy/configure/site-server-high-availability.md	✅Succeeded

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[prmerger-automator]

@PanuSaukko : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change. @sheetg09

[MandiOhlinger]

@PanuSaukko Hey Panu - This PR has a merge conflict. If it's still needed, can you create a new pull request? We want to make sure you get credit.

[Yupiter2005]

@PanuSaukko - thanks for the valuable contribution!

I feel like it's a good note on SMS Provider being not removed automatically. I'm not sure about Tenant Attach though. Do you mean the scenario when one decommissions and shuts down the ex-passive site server, so one of registered SMS Providers goes down?

Anyway, apologies for the long wait and please resubmit your PR as per Mandi's comment.