[issue21501] docs: mmap example for use in documentation

[Douwe Hoekstra]

Douwe Hoekstra <douwe.hoekstra2512 at gmail.com> added the comment:

Hi! I'd like to convert this to reST for the documentation. Additionally,
I think this example would benefit from additional explanation about how it functions.

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nosy: +dhoekstra

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<https://bugs.python.org/issue21501>
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