Add HISTORY and AUTHORS to lam

John A. Kunze requested to add himself as the authord of rs
on the FreeBSD bugzilla with the following text:

  Please re-instate my name (as "John A. Kunze") as AUTHOR of the
  jot, rs, and lam utilities.  I wrote these in 1982, around or
  before the time that I worked with Jordan at UCB (he left to work
  at FreeBSD and later at Apple).  Thank you!

  -- https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196786

While there add a note that this tool first appeared in BSD 4.2.
This information is based on the FreeBSD manual pages.

Patch submitted by Michal Mazurek <akfaew AT jasminek.net>.

Reviewed by <dholland>

usr.bin/lam/lam.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: lam.1,v 1.8 2012/12/13 21:09:34 pgoyette Exp $
+.\"	$NetBSD: lam.1,v 1.9 2016/01/04 23:31:44 kamil Exp $
 .\"
 .\" Copyright (c) 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -126,3 +126,10 @@ lam \-t @ letter changes
 .Xr join 1 ,
 .Xr pr 1 ,
 .Xr printf 3
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.Bx 4.2 .
+.Sh AUTHORS
+.An John A. Kunze