sync code with last fixes and improvements from OpenBSD

lib/libc/gen/execv.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: execv.3,v 1.1 2019/08/11 15:48:08 deraadt Exp $
+.\"	$OpenBSD: execv.3,v 1.2 2023/05/13 16:36:40 kn Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: August 11 2019 $
+.Dd $Mdocdate: May 13 2023 $
 .Dt EXECV 3
 .Os
 .Sh NAME
@@ -136,8 +136,14 @@ If this variable isn't specified,
 .Dv _PATH_DEFPATH
 from
 .In paths.h
-is used instead, its value being:
-.Pa /usr/bin:/bin:/usr/sbin:/sbin:/usr/X11R6/bin:/usr/local/bin
+is used instead, consisting of
+.Pa /usr/bin ,
+.Pa /bin ,
+.Pa /usr/sbin ,
+.Pa /sbin ,
+.Pa /usr/X11R6/bin ,
+.Pa /usr/local/bin ,
+.Pa /usr/local/sbin .
 .Pp
 In addition, certain errors are treated specially.
 .Pp
@@ -201,7 +207,9 @@ Historically, the default path for the
 and
 .Fn execvp
 functions was
-.Pa \&.:/bin:/usr/bin .
+.Pa \&. ,
+.Pa /bin ,
+.Pa /usr/bin .
 This was changed to improve security and behaviour.
 .Pp
 The behavior of