Don't workaround ancient macro argument limit with .Xo/.Xc.

usr.bin/sort/sort.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: sort.1,v 1.26 2008/05/02 18:11:06 martin Exp $
+.\"	$NetBSD: sort.1,v 1.27 2009/03/11 13:58:30 joerg Exp $
 .\"
 .\" Copyright (c) 2000-2003 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -221,10 +221,7 @@ This should be used with discretion;
 .Fl R Ar \*[Lt]alphanumeric\*[Gt]
 usually produces undesirable results.
 The default record separator is newline.
-.It Xo
-.Fl k
-.Ar field1 Ns Op Li \&, Ns Ar field2
-.Xc
+.It Fl k Ar field1 Ns Op Li \&, Ns Ar field2
 Designates the starting position,
 .Ar field1 ,
 and optional ending position,

usr.bin/systat/systat.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: systat.1,v 1.37 2007/02/18 17:29:26 dsl Exp $
+.\"	$NetBSD: systat.1,v 1.38 2009/03/11 13:58:29 joerg Exp $
 .\"
 .\" Copyright (c) 1985, 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -182,10 +182,7 @@ Print the load average over the past 1, 5, and 15 minutes
 on the command line.
 .It Ic stop
 Stop refreshing the screen.
-.It Xo
-.Op Ic start
-.Op Ar number
-.Xc
+.It Oo Ic start Oc Oo Ar number Oc
 Start (continue) refreshing the screen.
 If a second, numeric, argument is provided it is interpreted as a
 refresh interval in seconds.

usr.bin/telnet/telnet.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: telnet.1,v 1.30 2004/03/20 23:10:01 heas Exp $
+.\"	$NetBSD: telnet.1,v 1.31 2009/03/11 13:58:58 joerg Exp $
 .\"
 .\" Copyright (c) 1983, 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -581,13 +581,7 @@ Prints out help information for the
 .Ic mode
 command.
 .El
-.It Xo
-.Ic open Ar host
-.Op Fl l Ar user
-.Op Fl a
-.Oo Op \&- Ns
-.Ar port Oc
-.Xc
+.It Ic open Ar host Oo Fl l Ar user Oc Oo Fl a Oc Oo Oo \&- Oc Ns Ar port Oc
 Open a connection to the named host.
 If no port number
 is specified,