José Valim contributed the EEP 48, which as far as I know has been accepted. It describes how members of the BEAM ecosystem shall embed their documentation into the compiled modules.
Currently only elixir actually implements it. Erlang will do so from OTP 22 IIRC, so it will start in a couple of months.
I’m not sure what the state of LFE, Alpaca and others is currently.
