Add history section of pwd(1)

http://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/source/s2/pwd.c

PR:		211787
Approved by:	bcr (mentor)
MFC after:	5 days
Differential Revision:	https://reviews.freebsd.org/D8104

bin/pwd/pwd.1

@@ -32,7 +32,7 @@
 .\"     @(#)pwd.1	8.2 (Berkeley) 4/28/95
 .\" $FreeBSD$
 .\"
-.Dd April 12, 2003
+.Dd October 5, 2016
 .Dt PWD 1
 .Os
 .Sh NAME
@@ -85,6 +85,11 @@ The
 .Nm
 utility conforms to
 .St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Nm 
+command appeared in
+.At v5 .
 .Sh BUGS
 In
 .Xr csh 1