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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> (Ned asked for only release-critical changes to go into 3.6 at the moment.)

Except the documentation changes.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue28755>
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