add doc for tidb_allow_tiflash_cop (#15671)#15693

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ti-chi-bot[bot] merged 5 commits intopingcap:release-7.4from ti-chi-bot:cherry-pick-15671-to-release-7.4

Dec 13, 2023

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Commits on Dec 13, 2023

add doc for tidb_allow_tiflash_cop

guo-shaoge
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ti-chi-bot
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fix

guo-shaoge
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ti-chi-bot
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Update system-variables.md

ran-huang
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ti-chi-bot
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add to rn

ran-huang
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ti-chi-bot
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Apply suggestions from code review

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