reference: update documents about pessimistic transaction (#1854)#2205

Merged

sre-bot merged 4 commits into

pingcap:release-3.0from

sre-bot:release-3.0-965012863103

Apr 23, 2020

Commits on Apr 8, 2020

cherry pick #1854 to release-3.0

ran-huang
authored and
sre-bot
committed

Commits on Apr 10, 2020

resolve conflict and update v3.0 specific changes
ran-huang
committed

Commits on Apr 19, 2020

Merge branch 'release-3.0' into release-3.0-965012863103
ran-huang
authored

Commits on Apr 23, 2020

Merge branch 'release-3.0' into release-3.0-965012863103
ran-huang
authored