Document the version pwd first appeared.

Bump date.

bin/pwd/pwd.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: pwd.1,v 1.24 2003/10/30 14:58:23 wiz Exp $
+.\"	$NetBSD: pwd.1,v 1.25 2016/08/12 02:03:26 sevan Exp $
 .\"
 .\" Copyright (c) 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -32,7 +32,7 @@
 .\"
 .\"     @(#)pwd.1	8.2 (Berkeley) 4/28/95
 .\"
-.Dd October 30, 2003
+.Dd August 12, 2016
 .Dt PWD 1
 .Os
 .Sh NAME
@@ -87,6 +87,11 @@ except that the default is
 .Fl P
 not
 .Fl L .
+.Sh HISTORY
+A
+.Nm
+utility appeared in
+.At v5 .
 .Sh BUGS
 In
 .Xr csh 1