The remaining introduction of the "Correctness" section can be moved under
"Examples of unwanted behaviour" under the umbrella term "overly broad
questions". Add a link for "help vampirism" from the now removed Forum
guidelines to this subsection to make it a little clearer what kind of
questions are unwanted.

The remaining "Arch Linux distribution support ONLY" subsection doesn't really
fit into the rest of the Code of Conduct, so promote it to a separate section
to make it more visible.