extensions: libxt_bpf: clarify --bytecode argument

Mart Frauenlob suggested a change to explain the --bytecode
better. I have added some reference to the example bytecode
in the format that this argument accepts.

Reported-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 file changed