Clarify TiKV large-row limit in transaction restraints (#23338) (#23348)#23351

ti-chi-bot[bot] merged 3 commits into

pingcap:masterpingcap/docs:masterfrom

ti-chi-bot:cherry-pick-23348-to-masterti-chi-bot/docs:cherry-pick-23348-to-masterCopy head branch name to clipboard