[docs] [issue18177] Incorect quote marks in code section-headers in PDF version of docs

[Tshepang Lekhonkhobe]

Changes by Tshepang Lekhonkhobe <tshepang at gmail.com>:


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nosy: +tshepang

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18177>
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