Update checkpoint comments to be more accurate

Signed-off-by: boucher <rboucher@gmail.com>

cli/command/checkpoint/cmd.go

@@ -7,6 +7,6 @@ import (
 	"github.com/spf13/cobra"
 )
 
-// NewCheckpointCommand returns a cobra command for `checkpoint` subcommands
+// NewCheckpointCommand appends the `checkpoint` subcommands to rootCmd (only in experimental)
 func NewCheckpointCommand(rootCmd *cobra.Command, dockerCli *command.DockerCli) {
 }

cli/command/checkpoint/cmd_experimental.go

@@ -11,7 +11,7 @@ import (
 	"github.com/docker/docker/cli/command"
 )
 
-// NewCheckpointCommand returns a cobra command for `checkpoint` subcommands
+// NewCheckpointCommand appends the `checkpoint` subcommands to rootCmd
 func NewCheckpointCommand(rootCmd *cobra.Command, dockerCli *command.DockerCli) {
 	cmd := &cobra.Command{
 		Use:   "checkpoint",