Rewrite the sentence about the socket options to avoid questionable

typographic layout and to be more inline with the wording of the rest of
the man page.

share/man/man4/unix.4

@@ -1,4 +1,4 @@
-.\"	$NetBSD: unix.4,v 1.19 2007/08/09 15:23:03 he Exp $
+.\"	$NetBSD: unix.4,v 1.20 2009/08/23 19:32:16 joerg Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -168,12 +168,12 @@ Descriptors that are awaiting delivery, or that are
 purposely not received, are automatically closed by the system
 when the destination socket is closed.
 .Pp
-There are two
+A UNIX-domain socket supports two
 .Tn socket-level
-.Xr setsockopt 2 / Ns Xr getsockopt 2
-option available in the
-.Nm
-domain:
+options for use with
+.Xr setsockopt 2
+and
+.Xr getsockopt 2 :
 .Pp
 The
 .Dv LOCAL_CREDS