dev, v2.1, v3.0/how-to/upgrade: add DM upgrade advice #1451
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What is changed, added or deleted?
This PR adds advice to the DM upgrade guide.
What is the related PR or file link(s)?
pingcap/docs-cn#1656
pingcap/dm#212
Which version does your change affect?
dev
,v2.1
v3.0
Checklist
TOC.md
title
in metadataTOC.md