Update information-schema slow query & Statement.md (#12482)

[ti-chi-bot]

This is an automated cherry-pick of #12482

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[ti-chi-bot]

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This pull request has been approved by:

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[ran-huang]

/merge

[ti-chi-bot]

@ran-huang: /merge in this pull request requires 2 approval(s).

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/merge

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[ran-huang]

/merge

[ti-chi-bot]

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

Commit hash: 340c1d4