wtmp was actually arount in v2

https://www.tuhs.org/Archive/Distributions/Research/1972_stuff/unix_2nd_edition_manual.pdf
via Ingo Schwarze <schwarze@OpenBSD>

share/man/man5/utmp.5

@@ -1,4 +1,4 @@
-.\"	$NetBSD: utmp.5,v 1.17 2019/09/01 19:04:59 sevan Exp $
+.\"	$NetBSD: utmp.5,v 1.18 2019/09/09 00:21:03 sevan Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)utmp.5	8.2 (Berkeley) 3/17/94
 .\"
-.Dd September 1, 2019
+.Dd September 9, 2019
 .Dt UTMP 5
 .Os
 .Sh NAME
@@ -215,7 +215,7 @@ file format appeared in
 The
 .Nm wtmp
 file format appeared in
-.At v3 .
+.At v2 .
 The
 .Nm lastlog
 file format appeared in