Modify restart function prompt

Signed-off-by: zhouhao <zhouhao@cn.fujitsu.com>

api/client/container/restart.go

@@ -24,7 +24,7 @@ func NewRestartCommand(dockerCli *client.DockerCli) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "restart [OPTIONS] CONTAINER [CONTAINER...]",
-		Short: "Restart a container",
+		Short: "Restart one or more containers",
 		Args:  cli.RequiresMinArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			opts.containers = args

docs/reference/commandline/restart.md

@@ -13,7 +13,7 @@ parent = "smn_cli"
 ```markdown
 Usage:  docker restart [OPTIONS] CONTAINER [CONTAINER...]
 
-Restart a container
+Restart one or more containers
 
 Options:
       --help       Print usage

man/docker.1.md

@@ -161,7 +161,7 @@ inside it)
   See **docker-rename(1)** for full documentation on the **rename** command.
 
 **restart**
-  Restart a container
+  Restart one or more containers
   See **docker-restart(1)** for full documentation on the **restart** command.
 
 **rm**