That URI indicates to me that you have help set up to use local help first. One of the major pitfalls of doing that is that if there are typos in the help system, they may be corrected online, but they won't get updated in your local copy, so you could be working from inaccurate information.

I don't have local help to verify (I prefer not to use it for just that reason), but I believe that's what's happened here.