nontransactional dml FAQ about alias (#21313)#21415

ti-chi-bot[bot] merged 4 commits intopingcap:release-7.1pingcap/docs-cn:release-7.1from

ti-chi-bot:cherry-pick-21313-to-release-7.1ti-chi-bot/docs-cn:cherry-pick-21313-to-release-7.1Copy head branch name to clipboard