Yes, me!
I finally submitted a PR with some infos - hopefully it will soon be merged, then it will be easier to read 
Some other parts are already online:
http://docs.openhab.org/concepts/audio.html
http://docs.openhab.org/administration/runtime.html#audio
http://docs.openhab.org/addons/voice.html
As all of this is pretty new, please don’t expect it all to be smooth. Rather see it as an invitation to help improving it (code and documentation likewise!)