reference: update v2.1 auto-retry description #2111
Merged
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What is changed, added or deleted?
Changes the description of auto-retry in v2.1.
What is the related PR or file link(s)?
https://pingcap.com/docs/v2.1/reference/transactions/transaction-isolation/#transaction-retry
pingcap/docs#1690
Which version does your change affect?
v2.1