cdc: add description about canal-json content-compatible (#15568)#15762

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ti-chi-bot[bot] merged 3 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-15568-to-release-7.1

Dec 21, 2023

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Commits on Dec 18, 2023

cdc: add description about canal-json content-compatible

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Commits on Dec 21, 2023

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ran-huang
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