Describe 'bool'. Update 'list'.

Inspired by FreeBSD.

Note: we could seek more inspiration from FreeBSD WRT login.conf(5)
and login_cap(3)'s implementation.

share/man/man5/login.conf.5

@@ -1,4 +1,4 @@
-.\"	$NetBSD: login.conf.5,v 1.20 2006/10/14 18:52:39 christos Exp $
+.\"	$NetBSD: login.conf.5,v 1.21 2008/02/25 23:52:48 lukem Exp $
 .\"
 .\" Copyright (c) 1995,1996,1997 Berkeley Software Design, Inc.
 .\" All rights reserved.
@@ -33,7 +33,7 @@
 .\"
 .\" BSDI login.conf.5,v 2.19 1998/02/19 23:39:39 prb Exp
 .\"
-.Dd October 14, 2006
+.Dd February 26, 2008
 .Dt LOGIN.CONF 5
 .Os
 .Sh NAME
@@ -225,7 +225,8 @@ Maximum socket buffer size limit.
 .\"
 .sp
 .It Sy setenv Ta list Ta "" Ta
-Comma separated list of environment variables and values to be set.
+Comma or whitespace separated list
+of environment variables and values to be set.
 Commas and whitespace can be escaped using \e\e.
 .\"
 .sp
@@ -304,11 +305,15 @@ software).
 The argument types are defined as:
 .Bl -tag -width programxx
 .\"
+.It Sy bool
+If the name is present, then the boolean value is true;
+otherwise, it is false.
+.\"
 .It Sy file
 Path name to a text file.
 .\"
 .It Sy list
-A comma separated list of values.
+A comma or whitespace separated list of values.
 .\"
 .It Sy number
 A number.  A leading