Another alternative, probably easier to manage is to create the whole documentation like the vertx home page example.
Most of the documentation will be the same across all languages, what change is the code snippet as sample.
So my suggestion is to create only one set of doc across all languages and where a code snippet appear put a tabbed view (like the home page) for each language.
Those code snippet might be also gists hosted on github or some other sort of wiki that can be changed.
This solution should make the life easier for the project team as there is only one set of docs, but still keeping the language based examples.
What's your thoughts on this guys?
Bruno