[docs] [issue32284] typing.TextIO and BinaryIO are not aliases of IO[...]

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

This doc bug should be fixed before 3.6.4 final goes out.

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nosy: +gvanrossum, ned.deily
priority: normal -> release blocker

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32284>
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