For a package that contains the documents for a larger package foo, should you name it foo-doc or foo-docs?
fedora-30$ sudo dnf list | grep -oE -e '-docs?' | sort | uniq -c 4796 -doc 172 -docs
devuan-ceres$ apt-cache search doc | grep -oE -e '-docs?' | sort | uniq -c 4341 -doc 81 -docs
Which is close to the ratio I was expecting! Now we know for sure though.