note when these first appeared; ok jmc

src/lib/libc/stdlib/insque.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: insque.3,v 1.4 2005/07/07 07:48:59 jmc Exp $
+.\"	$OpenBSD: insque.3,v 1.5 2005/07/26 04:13:18 jaredy Exp $
 .\" Copyright (c) 1993 John Brezak
 .\" All rights reserved.
 .\"
@@ -98,3 +98,5 @@ and
 .Fn remque
 functions are derived from the insque and remque instructions on a
 .Tn VAX .
+They first appeared in
+.Bx 4.2 .