zh: document handle backup gc behavior and how to delete backup (#566) #575
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cherry-pick #566 to release-1.1
What is changed, added or deleted? (Required)
Fix #495 and fix #376
document the gc behavior in backup and how to delete backup
document for PR pingcap/tidb-operator#2897
Which TiDB Operator version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?