Looking into the code, we can confirm that the implementation is `{{ chapter_title }} - {{ book_title }}` and not `{{ book_title }} - {{ chapter_title }}` as written in the guide: 4c951d530d/src/renderer/html_handlebars/hbs_renderer.rs (L69)
4c951d530d/src/renderer/html_handlebars/hbs_renderer.rs (L69)
* List supported Highlight.js languages in guide Generated using the technique described in https://github.com/rust-lang/mdBook/issues/1275#issuecomment-655903967. * Improve wording in guide
`book-example` is a bit of a strange name given that it's not just an example.