use uppercase letters for flag usage

Signed-off-by: panguicai008 <guicai.pan@daocloud.io>

cmd/ctr/commands/tasks/pause.go

@@ -23,7 +23,7 @@ import (
 
 var pauseCommand = cli.Command{
 	Name:      "pause",
-	Usage:     "pause an existing container",
+	Usage:     "Pause an existing container",
 	ArgsUsage: "CONTAINER",
 	Action: func(context *cli.Context) error {
 		client, ctx, cancel, err := commands.NewClient(context)