This broadly looks good to me. We should update here to say that probes isn't number of packets per IP but per target IP/port pair. (This is my fault, but we should update it).

Can you make sure that we're also updating the --help text as well? Unfortunately the two are maintained separately. I think the text there is generally much shorter, but I did notice that under probes definition there it says packets per IP, which should be packets per ip/port too.

The last thing that I will note is that generally https://github.com/zmap/zmap/wiki has our most verbose documentation, so let's make sure that too stays in-sync with these changes.

@zakird I addressed your concerns and updated the wiki with the multi-port usages. If you could re-review whenever you have a chance, that'd be great!