upgrade using tiup: add FAQ for concurrent DDL (#15348)#15396

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-15348-to-release-6.5

Nov 21, 2023

+25

Commits on Nov 21, 2023

This is an automated cherry-pick of pingcap#15348

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