Documentation: 1.2.6 or 2.0

Hello.

Some projects have different reference manuals/documentation (e.g.
MySql 4.1, MySql 5.0, MySql 5.1,...) for each major release.

Is there an easy way to read the `Rails API` documentation (http://
api.rubyonrails.org/) that is specific to version 2?

You can run `gem server` then browse to http://localhost:8808/ to see
the versions you have installed.

Thanks!