wait was present in v1

https://www.bell-labs.com/usr/dmr/www/man22.pdf

lib/libc/sys/wait.2

@@ -1,4 +1,4 @@
-.\"	$NetBSD: wait.2,v 1.39 2016/11/20 09:38:37 wiz Exp $
+.\"	$NetBSD: wait.2,v 1.40 2019/09/02 00:12:11 sevan Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993, 1994
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)wait.2	8.2 (Berkeley) 4/19/94
 .\"
-.Dd November 10, 2016
+.Dd September 2, 2019
 .Dt WAIT 2
 .Os
 .Sh NAME
@@ -659,4 +659,4 @@ call are extensions to the POSIX interface.
 A
 .Fn wait
 function call appeared in
-.At v2 .
+.At v1 .