tidb-kubernetes: add backup and restore usage docs#1945

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TomShawn wants to merge 4 commits into

pingcap:masterfrom

TomShawn:k8s-b&r

Commits on Mar 4, 2020

Commits on Mar 9, 2020

tidb-in-kubernetes: refine language
TomShawn
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Commits on Mar 16, 2020

address comments from tennix
TomShawn
committed