[docs] [issue38352] In typing docs, note explicit import needed for IO and Pattern/Match

Ivan Levkivskyi <levkivskyi@gmail.com> added the comment:

So, my request is: In the sections for the IO/TextIO/BinaryIO and Pattern/Match classes, include text warning the user that these types are not imported when you do `from typing import *`.

I don't think this should really be a warning, probably just a note, but otherwise I totally agree. Would you like to make a PR? ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue38352> _______________________________________