document EACESS if __pledge_open() in /usr/share/zoneinfo terminates

on a non-regular file
ok dgl

lib/libc/sys/open.2

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: open.2,v 1.61 2026/05/15 04:55:45 jsg Exp $
+.\"	$OpenBSD: open.2,v 1.62 2026/05/21 02:22:18 deraadt Exp $
 .\"	$NetBSD: open.2,v 1.8 1995/02/27 12:35:14 cgd Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)open.2	8.2 (Berkeley) 11/16/93
 .\"
-.Dd $Mdocdate: May 15 2026 $
+.Dd $Mdocdate: May 21 2026 $
 .Dt OPEN 2
 .Os
 .Sh NAME
@@ -445,6 +445,12 @@ argument is
 and is a symbolic link, but does not point into
 .Pa /usr/share/zoneinfo
 correctly.
+.It Bq Er EACESS
+The
+.Fa path
+argument starts with
+.Pa /usr/share/zoneinfo
+and does not name a regular file.
 .It Bq Er ELOOP
 The
 .Fa path