Cherry pick doc fixes

[robertpanzer]

Thank you for opening a pull request and contributing to AsciidoctorJ!

Please take a bit of time giving some details about your pull request:

Kind of change

• [ ] Bug fix
• [ ] New non-breaking feature
• [ ] New breaking feature
• [x] Documentation update
• [ ] Build improvement

Description

This is a cherry-pick of #1110 into the main branch.