Update the description of pessimistic transaction #7247 (#6980)#7122

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ti-chi-bot merged 2 commits intopingcap:release-5.3from ti-chi-bot:cherry-pick-6980-to-release-5.3

Dec 8, 2021

+21-21

Commits on Dec 7, 2021

This is an automated cherry-pick of pingcap#6980

qiancai
authored and
ti-chi-bot
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Commits on Dec 8, 2021

Update pessimistic-transaction.md
qiancai
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