Add Xr diskless 8 because Suns can netboot.

Remove "floppy" from the example list of things that can UltraSPARC
can boot from.

share/man/man8/man8.sparc64/boot.8

@@ -1,4 +1,4 @@
-.\"	$NetBSD: boot.8,v 1.7 2003/05/01 11:16:28 wiz Exp $
+.\"	$NetBSD: boot.8,v 1.8 2003/05/01 18:44:11 fair Exp $
 .\"
 .\" Copyright (c) 1992, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -48,8 +48,9 @@
 .Oc
 .Sh DESCRIPTION
 .Tn Sun
+.Tn UltraSPARC
 systems support booting from locally attached storage media
-.Pq e.g. floppy, hard disk, Tn CD-ROM ,
+.Pq e.g. hard disk, Tn CD-ROM ,
 and booting over
 .Tn Ethernet
 networks using
@@ -239,5 +240,7 @@ developed its firmware and promoted it to become
 .Pa http://playground.sun.com/1275/
 .Sh BUGS
 .Nx
-provides no way to boot UltraSPARC systems from floppy disks.
+provides no way to boot
+.Tn UltraSPARC
+systems from floppy disks.
 This is unlikely to change, due to very low demand for this feature.