EVERY link I click on that is intended for a page in the Revit 2013 WikiHelp system gets redirected to the main landing page for Revit 2014 help.
I've experienced similar issues in the past with the C3D help system (links redirecting to the wrong version of C3D).
For a company that charges THOUSANDS for software, they should be able to provide a decent help system for that software.
Autodesk is going thru an online transformation at this time.
I believe I read that the Wiki System is down across the board and not functioning as you have indicated.
What I am not sure of is if it will be reinstituted.
The Forum for your product can be a great help if needed.
Found the relevant thread and the Wiki System is looking like it will be replaced with the online Help System. Probably why you are getting redirected to the online Help.