en: add a notice about topology example for scale-out (#369)#374

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ti-srebot merged 2 commits intopingcap:release-2.0from ti-srebot:release-2.0-bed308559767

Sep 9, 2020

+1

Commits on Sep 9, 2020

cherry pick pingcap#369 to release-2.0

ireneontheway
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Merge branch 'release-2.0' into release-2.0-bed308559767
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