updating usage for runc and runc commands

Signed-off-by: Mike Brown <brownwm@us.ibm.com>

restore.go

@@ -17,6 +17,12 @@ import (
 var restoreCommand = cli.Command{
 	Name:  "restore",
 	Usage: "restore a container from a previous checkpoint",
+	ArgsUsage: `<container-id>
+
+Where "<container-id>" is the name for the instance of the container to be
+restored.`,
+	Description: `Restores the saved state of the container instance that was previously saved
+using the runc checkpoint command.`,
 	Flags: []cli.Flag{
 		cli.StringFlag{
 			Name:  "image-path",