[issue17242] Fix code highlight in devguide/docquality.rst

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6015789cbce0 by Ezio Melotti in branch 'default':
#17242: fix code highlight.  Patch by Berker Peksag.
http://hg.python.org/devguide/rev/6015789cbce0

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nosy: +python-dev

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<http://bugs.python.org/issue17242>
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