fix a tikv-ctl help tips error (#5347)
fix a tikv-ctl help tips error (#5347)

Signed-off-by: mahjonp <1449a18b66cbe5d04a41cae2d6909e7c5eb42539@gmail.com>
BusyJay/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,pingcap/tikv,c4pt0r/tikv,BusyJay/tikv