[issue43680] Remove undocumented io.OpenWrapper and _pyio.OpenWrapper

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I also opened a discussion on python-dev about OpenWrapper and staticmethod:
https://mail.python.org/archives/list/python-dev@python.org/thread/QZ7SFW3IW3S2C5RMRJZOOUFSHHUINNME/

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<https://bugs.python.org/issue43680>
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