Currently the printer only supports the subset of markdown used by
educational notes. It bolds headers, improves the appearance of lists
and horizontal rules, and does basic indenting of blockquotes and
code blocks.
Educational notes are small pieces of documentation which explain a concept
relevant to some diagnostic message. If -enable-descriptive-diagnostics is
passed, they will be printed after a diagnostic message if available.
Educational notes can be found at /usr/share/doc/diagnostics in a
toolchain, and are associated with specific compiler diagnostics in
EducationalNotes.def.
Owen Voorhees