Remove the use of a dash in the usage, since this isn't in keeping

with other utilities which offer similar functionality.

This change was discussed with ache, who brought in the ability to
use a dash to represent stdin in comcontrol.

sbin/comcontrol/comcontrol.8

@@ -7,7 +7,7 @@
 .Nd control a special tty device
 .Sh SYNOPSIS
 .Nm comcontrol
-.Ar special_device | Fl
+.Ar special_device
 .Op dtrwait Ar number
 .Op drainwait Ar number
 .Sh DESCRIPTION

sbin/comcontrol/comcontrol.c

@@ -45,7 +45,7 @@ static void
 usage()
 {
 	fprintf(stderr,
-	"usage: comcontrol <filename>|- [dtrwait <n>] [drainwait <n>]\n");
+	"usage: comcontrol <filename> [dtrwait <n>] [drainwait <n>]\n");
 	exit(1);
 }