cdc: add description about ticdc lightning compatibility (#19047)#19069

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-19047-to-release-6.5

Nov 13, 2024

+17-6

Commits on Nov 13, 2024

This is an automated cherry-pick of pingcap#19047

3AceShowHand
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