[docs] [issue13574] refresh example in doc for Extending and Embedding

[Berker Peksag]

Berker Peksag <berker.peksag at gmail.com> added the comment:

The documentation has been modernized in https://github.com/python/cpython/commit/1d80a561734b9932961c546b0897405a3bfbf3e6 and the "Weak Reference Support" section has been updated to show the modern way of adding weakref support:

    https://github.com/python/cpython/commit/1d80a561734b9932961c546b0897405a3bfbf3e6#diff-1ace1cc14bb5b7f4ee77f22238ede084R556

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nosy: +berker.peksag
resolution:  -> out of date
stage: needs patch -> resolved
status: open -> closed

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<https://bugs.python.org/issue13574>
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