ucom.4: Canonicalize SYNOPSIS + tag SPDX

Event:		EuroBSDcon 2026
MFC after:	3 days

share/man/man4/ucom.4

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" $NetBSD: ucom.4,v 1.9 2002/03/22 00:39:40 augustss Exp $
 .\"
 .\" Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -34,19 +37,19 @@
 .Nm ucom
 .Nd USB tty support
 .Sh SYNOPSIS
-To compile this driver into the kernel,
-place the following line in your
-kernel configuration file:
-.Bd -ragged -offset indent
-.Cd "device ucom"
-.Ed
+.Cd device ucom
 .Pp
-Alternatively, to load the driver as a
-module at boot time, place the following line in
+In
 .Xr loader.conf 5 :
-.Bd -literal -offset indent
-ucom_load="YES"
-.Ed
+.Cd ucom_load="YES"
+.Pp
+.In
+.Xr loader.conf 5
+or
+.Xr sysctl.conf 5 :
+.Cd hw.usb.ucom.debug
+.Cd hw.usb.ucom.device_mode_console
+.Cd hw.usb.ucom.pps_mode
 .Sh DESCRIPTION
 The
 .Nm