[IPX]: Remove outdated information from Kconfig
SPX was removed in early 2.5. How to connect to a Mac or the other OS isn't
hard to find out these days.
Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
authored by Rolf Eike Beer and committed by David S. Miller ff49f26b 304c209c