Add history section for dd(1)

First version of UNIX to include dd found using TUHS
http://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/source/s1/dd.c

PR:		211777
Approved by:	bcr (mentor)
MFC after:	5 days
Differential Revision:	https://reviews.freebsd.org/D8104

bin/dd/dd.1

@@ -32,7 +32,7 @@
 .\"     @(#)dd.1	8.2 (Berkeley) 1/13/94
 .\" $FreeBSD$
 .\"
-.Dd August 25, 2016
+.Dd October 5, 2016
 .Dt DD 1
 .Os
 .Sh NAME
@@ -447,6 +447,11 @@ and
 values are extensions to the
 .Tn POSIX
 standard.
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v5 .
 .Sh BUGS
 Protection mechanisms in the
 .Xr geom 4