Correct documentation regarding PROMISC and ALLMULTI.

The ip util would happily change these flags, it's just not recommended.
Reflect that in the doc.

The behaviour of ifconfig is exactly the same as of ip, delete the note about
it.

Signed-off-by: Tomas Janousek <tjanouse@redhat.com>
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
1 file changed