Documentation update for com_baud = 57600 ?

Hi there,

Whilst re-reading the various guides, I thought I found I had missed a step, when I spotted the comment about setting the baud rate to 57600 in /boot/emonhub.conf when using the RFM69CW within this page https://github.com/emoncms/emoncms/blob/low-write/docs/setup.md

I then checked my /boot/emonhub.conf and the comment was not included, which confused me. After further searching I found that the baud is now auto-detected, which would explain why the comment doesn't appear in my config file, and also means I didn't miss out the step -phew !

Any chance the setup.md doc can be updated ?

(It must be a nightmare trying to keep all of the guides up to date, and I hope feedback like this is helpful? Please let me know if there is a different way you would like such feedback)

Ian