Today, @rwinch and I were discussing the merits of leaving commit messages free of formatting hints, like back-ticks. Adding this bullet-point brings things into line with expectations.
Direct changes to XSD schemas will be overwritten by the build, it is necessary that the developer updates the RELAX NG schema instead.
See discussion on commit e297706e8bfda38117a99fd06dace74c5a8cc5f1.