Link to classes' source code from the class reference

A lot of GDScript's documentation is lacking. A lot of explanations of functions don't explain much more than the name. I generally find that if I want to know what a function actually does, I've got to go to the CPP file that implements it in the backend. For instance, does lerp clamp t between 0 and 1? Apparently not - and that makes a big difference as far as bugs go if you're expecting otherwise. Can we have links directly to the CPPs from within the documentation?

Also... you know, it'd be a lot easier to contribute to the docs if you were using a wiki or something instead.