Sync to reality; add missing tracepoint options.

usr.bin/ktrace/ktrace.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: ktrace.1,v 1.8 1997/10/19 03:40:03 lukem Exp $
+.\"	$NetBSD: ktrace.1,v 1.9 1998/06/27 04:21:54 nathanw Exp $
 .\"
 .\" Copyright (c) 1990, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -118,6 +118,10 @@ trace
 .Tn I/O
 .It Cm s
 trace signal processing
+.It Cm w
+trace context switches
+.It Cm + 
+trace the default set of trace points (c, e, n, i, s)
 .El
 .It Ar command
 Execute