linux-imx

ip: update policy routing config help

The kernel config help for policy routing was still pointing at
an ancient document from 2000 that refers to Linux 2.1. Update it
to point to something that is at least occasionally updated.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>