Document l_type usage explicitly; fixes PR misc/10325.

lib/libc/sys/fcntl.2

@@ -1,4 +1,4 @@
-.\"	$NetBSD: fcntl.2,v 1.18 1999/12/02 21:42:36 kleink Exp $
+.\"	$NetBSD: fcntl.2,v 1.19 2001/05/05 19:48:04 kleink Exp $
 .\"
 .\" Copyright (c) 1983, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -33,7 +33,7 @@
 .\"
 .\"     @(#)fcntl.2	8.2 (Berkeley) 1/12/94
 .\"
-.Dd January 12, 1994
+.Dd May 5, 2001
 .Dt FCNTL 2
 .Os
 .Sh NAME
@@ -190,7 +190,9 @@ in the
 structure.
 If no lock is found that would prevent this lock from being created,
 the structure is left unchanged by this function call except for the
-lock type which is set to
+lock type
+.Fa l_type ,
+which is set to
 .Dv F_UNLCK .
 .It Dv F_SETLK
 Set or clear a file segment lock according to the lock description
@@ -199,6 +201,8 @@ pointed to by the third argument,
 taken as a pointer to a
 .Fa "struct flock"
 (see above).
+As specified by the value of
+.Fa l_type ,
 .Dv F_SETLK
 is used to establish shared (or read) locks
 .Dv (F_RDLCK)