I removed the info about read-only lists getting swatch "c" by default because it is incorrect. How inheriting the page/content swatch works is explained at "theming lists" page and is the same for all types of lists.
Added info about read-only lists being styled as body and not as buttons.
Changed info about read-only lists
@agcolom hi Anne,
In the thread of issue #4347 I noticed confusion about in what way you can style read-only lists currently. So I thought, lets clarify this in the docs. I totally forgot that you mentioned in the same thread that you were going to do that. Sorry, I didn't want to interfere or act impatient.