ticdc: update the warning for using redo log

[shichun-0415]

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[zier-one]

LGTM

[shichun-0415]

/remove status LGT1
/status LGT2

[shichun-0415]

/merge

[ti-chi-bot]

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

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Commit hash: 0eda231

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #11197.