tools: minor update for drainer's relay log (#2308)#2309

Merged

yikeke merged 1 commit intopingcap:release-3.0from sre-bot:release-3.0-8662295b6e77

Feb 26, 2020

+1-1

Commits on Feb 26, 2020

Update relay-log.md

WangXiangUSTC
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