Use "path name" not "pathname".

src/lib/libc/stdlib/ptsname.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: ptsname.3,v 1.1 2012/12/03 20:08:33 millert Exp $
+.\"	$OpenBSD: ptsname.3,v 1.2 2012/12/04 18:42:16 millert Exp $
 .\"
 .\" Copyright (c) 2002 The FreeBSD Project, Inc.
 .\" All rights reserved.
@@ -32,7 +32,7 @@
 .\"
 .\" $FreeBSD: head/lib/libc/stdlib/ptsname.3 240412 2012-09-12 17:54:09Z emaste $
 .\"
-.Dd $Mdocdate: December 3 2012 $
+.Dd $Mdocdate: December 4 2012 $
 .Dt PTSNAME 3
 .Os
 .Sh NAME
@@ -75,7 +75,7 @@ group
 .Pp
 The
 .Fn ptsname
-function returns the full pathname of the slave device
+function returns the full path name of the slave device
 counterpart to the master device specified with
 .Fa fildes .
 This value can be used