Port Fwd: documentation clarificaition

It is solved but it took me a while.

slirp_add_hostfwd takes the address in standard network order, but the port in host order.

I found it strange because I was coming from other network functions like inet_ntop and getaddrinfo where the port in is network order too.

At least this is what I found with some trial and error.

Maybe the doc should specify it.