With the upcoming 2.1 [web-console release], I have tweaked the existing
documentation a bit. I tried to focus on the spawning console use case,
because I think a lot of people overlook that.

Tried to explain it as best as I can, however, my English and prose
aren't my best skills :) If you guys can chime in and help me improve
the wording, I would be extremely grateful.

There has been some configuration default changes. For example, the
whitelisted IPs always include IPv4 and IPv6 localhosts now and this
wasn't the case in 2.0. I think a lot of people got bitten by it, that's
why I changed it. I'm a bit confused on how to document this. Should I
just document the latest version, I don't think I can expect all the
people reading the guide to be on it.

[web-console release]: https://github.com/rails/web-console/pull/110