I have OACS 4.01 running, and grep for 'content-section' doesn't yield anything (and neither does 'custom-section'). Needless to say, there is nothing in the admin directory. I guess content-repository and cms completely superseded the sections...
It's kind of hard to figure out which (part of the) documentation applies to which version. I understand that maintaining docs is a hassle, but one might expect that the availability of a CMS would help 😉.
