of course I know that document is related to Kentico Version 6 , but would you please try to find documentation related to that topic in Kentico 8 documentation on doc.kentico.com and see if you've got any success or not ? (because that topic is strongly valid in Kentico 8 according to sample ecommerce web site in Kentico 8 ,so developers need to review documentation about that)
and this scenario happens for lots of topics in your new documentation system...