The new location of the documentation can be checked at: Documentation for XS.
There, you’ll find the mentioned doc pages, including the newly organized Edit a Page, which has now subpages that were previously sections of the old Page editing doc page. This page has been split according to Diataxis, with the help of the Documentation XClass, to separate types of contents such as howtos, explanations, references, etc :
They are all accessible through the LiveTables as well.
Thanks!