tutorial: add doc for store limit (#2947)#3111

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ran-huang merged 4 commits into

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ti-srebot:release-4.0-23e53ef3c2b8

Jul 3, 2020

Commits on Jul 2, 2020

cherry pick #2947 to release-4.0

ran-huang
authored and
ti-srebot
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align with https://github.com/pingcap/docs-cn/pull/3832
ran-huang
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Commits on Jul 3, 2020