Allow formatting of list descriptions
We're starting to migrate some of the python.org mailing lists to Mailman 3 (huzzah!), but we're hitting a problem where the list descriptions are losing all their formatting: https://mail.python.org/mm3/mailman3/lists/core-mentorship.python.org/
@msapiro wasn't aware of any existing way to restore that formatting, hence this feature request.
Edited by Nick Coghlan