You are right, however this error only remains in the old online reference. In the current reference that for example comes with 2.0a5 I already see that it says int. Which is technically correct because a color is an int (in my opinion the reference could also just state color btw).

Anyway, when you want to report issues use: http://code.google.com/p/processing/issues/list

That url is as basic as it gets and seems to be the "current" documentation. Are you saying the docs will be updated soon?

Probably once Processing 2.0 is released, so not too soon I guess.

If you want it fixed now, feel free to submit an issue via the link above. The devs don't read (all) the forum (posts).