update incorrect comments of CheckpointList
update incorrect comments of CheckpointList

Signed-off-by: allencloud <36603fc76d0c5a59db517817381acc1be27b9499@daocloud.io>

cpuguy83/cli,thaJeztah/cli,Zebrilee/cli,docker/cli,redpanda/cli,allencloud/cli,cpuguy83/cli,dnephin/cli,Zebrilee/cli,thaJeztah/cli,allencloud/cli,riyazdf/cli,riyazdf/cli,e11137/cli,dnephin/cli,e11137/cli,redpanda/cli,docker/cli,gdevillele/cli,ashfall/cli,ashfall/cli