Eliminate groff warning. Add protocol reference in SEE ALSO section.

A little more verbiage for clarity.

share/man/man4/ulpt.4

@@ -1,4 +1,4 @@
-.\" $NetBSD: ulpt.4,v 1.10 2009/04/10 15:09:26 joerg Exp $
+.\" $NetBSD: ulpt.4,v 1.11 2009/05/17 05:08:57 fair Exp $
 .\"
 .\" Copyright (c) 1999 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd July 12, 1998
+.Dd May 16, 2009
 .Dt ULPT 4
 .Os
 .Sh NAME
@@ -38,13 +38,18 @@
 .Sh DESCRIPTION
 The
 .Nm
-driver provides support for USB printers that follow the printer
-bi- or uni-directional protocol.
-The bits in the minor number select various features of the driver.
+driver provides support for Universal Serial Bus
+.Pq Tn USB
+printers that follow either the
+.Tn USB
+printer uni-directional or bi-directional protocol.
+.Pp
+Additional bits OR-ed in the minor device number with the unit number
+select various features of the driver:
 .Pp
 .Bl -column "Minor Bit" "Functionxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -offset indent
-.It Sy "Minor Bit"	Function
-.It 64	\&Do not initialize (reset) the device on the port.
+.It Sy "Minor Bit" Ta Sy Function
+.It 0x40 Ta \&Do not initialize (reset) the device on the port.
 .El
 .Pp
 Some printers cannot handle the reset on open; in case of problems try the
@@ -53,13 +58,21 @@ device.
 .Sh FILES
 .Bl -tag -width xxxxxxxxxx
 .It Pa /dev/ulpt?
-device with reset
+.Tn USB
+printer with reset on open
 .It Pa /dev/ulpn?
-device without reset
+.Tn USB
+printer without reset on open
 .El
 .Sh SEE ALSO
 .Xr lpt 4 ,
 .Xr usb 4
+.Rs
+.%T USB Device Class Definition for Printing Devices
+.%I USB Implementors Forum
+.%D January 2000
+.Re
+.Pa http://www.usb.org/developers/devclass_docs/usbprint11.pdf
 .Sh HISTORY
 The
 .Nm