It's good but it could be better.

e.g:

- stack overflow running on top of that to rate comments + index questions asked on functions

- smart snippet indexer. Examples rarely cover everything

- smart way to deal with changes over multiple revisions. Functions are updated and comments are either deprecated or it's a new page.

I think one should work on something like stackoverflow but for documentation. Where you could supply some sort of parser for your specific programming language but have something uniform with all the basics.