Wrote a blog post on mdoc, a documentation tool that typechecks Scala code examples in markdown files. https://scalameta.org/mdoc/blog/2019/12/30/introduction.html mdoc is used by Scalafmt, Scalafix and several other open source projects.
Release notes for v1.0.0: https://scalameta.org/mdoc/blog/2018/12/30/v1.html