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

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


----------
pull_requests: +4725

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