kadb(4) is dead, long live ddb(4)

remove obsolete BUGS section (hp300 supports RB_KDB, and apparently
  nothing uses RB_DFLTROOT anymore)

lib/libc/sys/reboot.2

@@ -1,4 +1,4 @@
-.\"	$NetBSD: reboot.2,v 1.7 1996/08/10 00:22:29 mrg Exp $
+.\"	$NetBSD: reboot.2,v 1.8 1997/07/15 03:04:56 mikel Exp $
 .\"
 .\" Copyright (c) 1980, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -100,7 +100,7 @@ via the
 .Fn reboot
 call.
 See
-.Xr kadb 4
+.Xr ddb 4
 for more information.
 .It Dv RB_NOSYNC
 Normally, the disks are sync'd (see
@@ -146,17 +146,12 @@ variable
 The caller is not the super-user.
 .El
 .Sh SEE ALSO
-.Xr kadb 4 ,
+.Xr ddb 4 ,
 .Xr crash 8 ,
 .Xr halt 8 ,
 .Xr init 8 ,
 .Xr reboot 8 ,
 .Xr savecore 8
-.Sh BUGS
-The HP300 implementation supports neither
-.Dv RB_DFLTROOT
-nor
-.Dv RB_KDB .
 .Sh HISTORY
 The
 .Fn reboot