I suspect it used to link to this page - http://helpx.adobe.com/coldfusion/kb/coldfusion-mx-best-practices-lock ing.html - or some facsimile thereof.
You're dead right that the docs ought to be updated, but in case anyone wants to read the doc in question, there you go.
Good on you for trying to improve Adobe's docs. They could take a leaf out of your book, I think 
--
Adam