[selectors] match_kwargs and match_form_params selectors both accept a new `once_is_enough` argument (closes #1990438)
also fix docstring of match_exception and references to selectors in the book.
.. -*- coding: utf-8 -*-
Dernières modifications
-----------------------
* la table des `derniers changements`_ fournit un exemple d'utilisation de RQL
pour récupérer les derniers changements ayant eu lieu sur ce site.
.. _`derniers changements`: view?rql=Any+M%2CX+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30