On the documentation page for “Page components” - the example for a layout uses 6.x terminology:
https://developer.enonic.com/docs/xp/stable/cms/components#layout
For the layout xml definition, config should be replaced with form.
Thanks for letting us know - this has been fixed now 
I would like to “slå et slag” for the fact that the entire docs is open source, available at Github for anyone to send PRs to! Just go to the repo, and you can navigate the folder structure (just begin by clicking the folder docs and then follow the developer portals URL to the page, removing xp/stable/). You can then easily edit a page directly from Github and create a PR from it. I think Enonic would appriciate that a lot =)
Very good point. I will try to do that from now on.