Merge tag 'docs-5.0-fix' of git://git.lwn.net/linux

Pull documentation fix from Jonathan Corbet:
 "A single patch from Arnd bringing some top-level docs into the 5.0
  era"

* tag 'docs-5.0-fix' of git://git.lwn.net/linux:
  Documentation: change linux-4.x references to 5.x