ticdc: add note to the Avro protocol (#19636)#19655

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ti-chi-bot[bot] merged 3 commits intopingcap:release-8.4from ti-chi-bot:cherry-pick-19636-to-release-8.4

Jan 22, 2025

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Commits on Jan 22, 2025

Update ticdc-avro-protocol.md

wk989898
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ti-chi-bot
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Update ticdc/ticdc-avro-protocol.md

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format udpates

qiancai
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