ticdc: Add a description of the compatibility between BR and Lightning (#16451)#16476

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ti-chi-bot[bot] merged 2 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-16451-to-release-6.5

Feb 7, 2024

Commits on Feb 7, 2024

This is an automated cherry-pick of pingcap#16451

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