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

[Martin Panter]

Martin Panter added the comment:

It will apply to the 3.5 and 3.6 branches if I first backport revision 0a18d2cfeb52 (Issue 28753), which I think is valid. But I would wait until there is a branch for 3.6.1, and then commit to all three branches. (Ned asked for only release-critical changes to go into 3.6 at the moment.)

On the other hand, Larry only applied the other patch to 3.7, so we could just do that again if people prefer.

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nosy: +martin.panter
stage:  -> commit review
versions: +Python 3.5 -Python 2.7

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