cmd/commands: fix custom message commands

The sendcustom and subscribecustom sub commands weren't correctly
categorized and didn't have any usage text set.

cmd/commands/cmd_custom.go

@@ -10,6 +10,8 @@ import (
 
 var sendCustomCommand = cli.Command{
 	Name:     "sendcustom",
+	Category: "Peers",
+	Usage:    "Send a custom p2p wire message to a peer",
 	Flags: []cli.Flag{
 		cli.StringFlag{
 			Name: "peer",
@@ -56,6 +58,9 @@ func sendCustom(ctx *cli.Context) error {
 
 var subscribeCustomCommand = cli.Command{
 	Name:     "subscribecustom",
+	Category: "Peers",
+	Usage: "Subscribe to incoming custom p2p wire messages from all " +
+		"peers",
 	Action: actionDecorator(subscribeCustom),
 }
 
@@ -65,8 +70,7 @@ func subscribeCustom(ctx *cli.Context) error {
 	defer cleanUp()
 
 	stream, err := client.SubscribeCustomMessages(
-		ctxc,
+		ctxc, &lnrpc.SubscribeCustomMessagesRequest{},
-		&lnrpc.SubscribeCustomMessagesRequest{},
 	)
 	if err != nil {
 		return err