[docs] [issue26515] Update extending/embedding docs to new way to build modules in C

[Berker Peksag]

Change by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +berker.peksag
type:  -> enhancement
versions: +Python 3.7, Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26515>
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