ctl: add a note for all ctl docs (#6096)#6098

Merged

ti-chi-bot merged 4 commits intopingcap:release-3.0from ti-srebot:release-3.0-ab487f7ac001

Apr 22, 2021

+28-34

Commits on Apr 21, 2021

cherry pick pingcap#6096 to release-3.0

yikeke
authored and
ti-srebot
committed
resolve conflicts
yikeke
committed
Delete binlog-control.md
yikeke
committed

Commits on Apr 22, 2021

remove manual breaks
yikeke
committed