Update the multi-schema change DDL limitation

[Oreoxmt]

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• This PR is translated from: Update the multi-schema change DDL limitation docs-cn#10457
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• Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn
• tangenta

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[TomShawn]

rest LGTM

[Oreoxmt]

/merge

[ti-chi-bot]

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

Commit hash: 7685440