[docs] [issue28755] Rework syntax highlighing in howto/clinic.rst

[Julien Palard]

Changes by Julien Palard <julien+python at palard.fr>:


Added file: http://bugs.python.org/file45575/issue28755-2.diff

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28755>
_______________________________________