pr_template: Provides tips for cherry-pick (#6042)#6121

TomShawn merged 3 commits into

pingcap:release-5.0pingcap/docs:release-5.0from

ti-chi-bot:cherry-pick-6042-to-release-5.0ti-chi-bot/docs:cherry-pick-6042-to-release-5.0Copy head branch name to clipboard