README.md: remove outdated file path description (#2579)#2588

Merged

yikeke merged 1 commit intopingcap:release-4.0from sre-bot:release-4.0-16faa5722e9c

May 15, 2020

+20-30

Commits on May 15, 2020

README.md: remove outdated file path description (pingcap#2579 )

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