Document some culprits with pre-commit (#1783)

* Document some culprits with pre-commit

* make pre-commit happy

* don't use monospace for black & pre-commit

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

* make pre-commit happy again

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>