Add information that catalog corruption can cause instance crashes

[kendra-little]

Please document that the catalog corruption can cause stack dumps and crashes of the SQL Server service. This has been verified by Microsoft Support, see case TrackingID #2504240010002403

[prmerger-automator]

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

[learn-build-service-prod]

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azure-sql/managed-instance/doc-changes-updates-known-issues.md	✅Succeeded

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[v-dirichards]

@MashaMSFT

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[rwestMSFT]

Checking with product group.

[kendra-little]

I think that this issue actually does not cause service crashes (evidence points to a misdiagnosis by Microsoft support), so closing this PR. Thank you!