Now that we have a patch system and anyone can help add spell documentation from within the level editor, I wrote a guide for how to add documentation for various JS builtin types by looking at the Mozilla Developer Network documentation and excerpting it for CodeCombat:
#399: Help Document Object, Function, and other built-in objects
#1237: Add property documentation syntax for Python, CoffeeScript, Lua, Clojure, Io
Would really appreciate any help in getting all these builtins documented, and these other languages unleashed!