[doc] Update book sections about cubes being Python packages
Related to #1300146006.
.. -*- coding: utf-8 -*-
Writing text reports with RestructuredText
==========================================
|cubicweb| offers several text formats for the RichString type used in schemas,
including restructuredtext.
Three additional restructuredtext roles are defined by |cubicweb|:
.. autofunction:: cubicweb.ext.rest.eid_reference_role
.. autofunction:: cubicweb.ext.rest.rql_role
.. autofunction:: cubicweb.ext.rest.bookmark_role