Update how-to-troubleshoot-common-errors.md (Typo "flexible server"→"…

[hyoshioka0128]

…Flexible Server")

https://github.com/MicrosoftDocs/azure-databases-docs/blob/main/articles/mysql/flexible-server/how-to-troubleshoot-common-errors.md
#PingMSFTDocs

[prmerger-automator]

@hyoshioka0128 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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[ShannonLeavitt]

@SudheeshGH

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

[Court72]

@SudheeshGH - I'll merge this PR based on your approval. If this article requires further changes, please open a separate pull request.

[hyoshioka0128]

@SudheeshGH - related #10