ticdc: update the warning for using redo log (#10314)

[ti-chi-bot]

This is an automated cherry-pick of #10314

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• This PR is translated from: ticdc: update the warning for using redo log docs-cn#11182
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• Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shichun-0415

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[shichun-0415]

/merge

[ti-chi-bot]

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

Commit hash: 8a108f8