GH workflows aren't allowed to trigger other GH workflows. Since
commitlint is a required check now, we need something manual to happen
for it to run on vim-patch/api-doc PRs.
Creating these PRs as drafts and then marking them as "ready to review"
when we want to merge them will provide the manual trigger to run
commitlint.
[skip ci]
Upon pushing updates to files which may contain API documentation, the
workflow will regenerate the docs and, if there are relevant changes,
create a PR targeting the source branch.
[skip ci]
