[docs] [issue33666] os.errno gone AWOL

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> os.errno as well as os.sys or os.abc is an implementation detail.

I agree but...

> It can be changed without notice even in a bugfix release. Projects that depend on it are incorrect and should be fixed.

I don't think that it would hurt to document the removal of "os.errno" in "Porting to Python 3.7":
https://docs.python.org/dev/whatsnew/3.7.html#changes-in-python-behavior

Miro: are you volunteer to write such change?

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nosy: +vstinner

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