Doc: Agent ctor options are not fully documented, such as `lookup`
ref:
issue:
- Agent ctor does accept options that will be used by
socket.connect
. - But I can't find any reference of this at
new Agent([options])
. - To be fair,
agent.createConnection(options[, callback])
does mention this but few users realize this allows them to make custom dns lookup via passing a custom Agent instance.