dev guide: use SimpleTab to describe two MySQL clients (#12469)

[ti-chi-bot]

This is an automated cherry-pick of #12469

Signed-off-by: Aolin aolin.zhang@pingcap.com

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• This PR is translated from: Correct MySQL Shell/Client section docs-cn#12987
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[Oreoxmt]

/merge

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This pull request has been accepted and is ready to merge.

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Commit hash: ee6f6b8