updating usage for runc and runc commands

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

kill.go

@@ -52,6 +52,15 @@ var signalMap = map[string]syscall.Signal{
 var killCommand = cli.Command{
 	Name:  "kill",
 	Usage: "kill sends the specified signal (default: SIGTERM) to the container's init process",
+	ArgsUsage: `<container-id> <signal>
+
+Where "<container-id>" is the name for the instance of the container and
+"<signal>" is the signal to be sent to the init process.
+	 
+For example, if the container id is "ubuntu01" the following will send a "KILL"
+signal to the init process of the "ubuntu01" container:
+	 
+       # runc kill ubuntu01 KILL`,
 	Action: func(context *cli.Context) {
 		container, err := getContainer(context)
 		if err != nil {