Add v5.1.0 / release-5.1 where it is missing (#6761)#6765

Merged

ti-chi-bot merged 2 commits intopingcap:release-2.1from ti-chi-bot:cherry-pick-6761-to-release-2.1

Jul 29, 2021

+2

Commits on Jul 29, 2021

This is an automated cherry-pick of pingcap#6761

TomShawn
authored and
ti-chi-bot
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Update README.md
TomShawn
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