keep the uppercase letter for flag info

Signed-off-by: yulng <wei.yang@daocloud.io>

cmd/ctr/commands/containers/checkpoint.go

@@ -33,15 +33,15 @@ var checkpointCommand = cli.Command{
 	Flags: []cli.Flag{
 		cli.BoolFlag{
 			Name:  "rw",
-			Usage: "include the rw layer in the checkpoint",
+			Usage: "Include the rw layer in the checkpoint",
 		},
 		cli.BoolFlag{
 			Name:  "image",
-			Usage: "include the image in the checkpoint",
+			Usage: "Include the image in the checkpoint",
 		},
 		cli.BoolFlag{
 			Name:  "task",
-			Usage: "checkpoint container task",
+			Usage: "Checkpoint container task",
 		},
 	},
 	Action: func(context *cli.Context) error {

cmd/ctr/commands/containers/containers.go

@@ -99,7 +99,7 @@ var listCommand = cli.Command{
 	Flags: []cli.Flag{
 		cli.BoolFlag{
 			Name:  "quiet, q",
-			Usage: "print only the container id",
+			Usage: "Print only the container id",
 		},
 	},
 	Action: func(context *cli.Context) error {
@@ -153,7 +153,7 @@ var deleteCommand = cli.Command{
 	Flags: []cli.Flag{
 		cli.BoolFlag{
 			Name:  "keep-snapshot",
-			Usage: "do not clean up snapshot with container",
+			Usage: "Do not clean up snapshot with container",
 		},
 	},
 	Action: func(context *cli.Context) error {
@@ -251,7 +251,7 @@ var infoCommand = cli.Command{
 	Flags: []cli.Flag{
 		cli.BoolFlag{
 			Name:  "spec",
-			Usage: "only display the spec",
+			Usage: "Only display the spec",
 		},
 	},
 	Action: func(context *cli.Context) error {

cmd/ctr/commands/containers/restore.go

@@ -36,11 +36,11 @@ var restoreCommand = cli.Command{
 	Flags: []cli.Flag{
 		cli.BoolFlag{
 			Name:  "rw",
-			Usage: "restore the rw layer from the checkpoint",
+			Usage: "Restore the rw layer from the checkpoint",
 		},
 		cli.BoolFlag{
 			Name:  "live",
-			Usage: "restore the runtime and memory data from the checkpoint",
+			Usage: "Restore the runtime and memory data from the checkpoint",
 		},
 	},
 	Action: func(context *cli.Context) error {