[issue33477] Document that compile(code, 'exec') has different behavior in 3.7+

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

ref #32911

And it's documented already.
https://docs.python.org/3.7/whatsnew/3.7.html#changes-in-the-python-api

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nosy: +inada.naoki

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