There are two different pages, http://docs.jquery.com/Types and http://api.jquery.com/Types/ , documenting "virtual types". It seems they might at some point contained the same information, however they now no longer do (it appears that http://docs.jquery.com/Types have not been kept up-to-date).

I don't know the strategy behind the resources/pages/documentation on jquery.com but perhaps there should only be one page documenting "virtual types", otherwise both should be kept up-to-date.