[issue40979] typing module docs: keep text, add subsections

[Luciano Ramalho]

Luciano Ramalho <luciano at ramalho.org> added the comment:

Reviewers, besides adding section titles and reordering the entries, I made only these changes to the text:

- entry for IO, TextIO, BinaryIO: added sentence "These types are in the ``typing.io`` namespace."

- entry for Pattern, Match: added sentence "These types are in the ``typing.re`` namespace."

- entry for TypedDict: removed the words "equivalent to" from the sentence "At runtime it is <equivalent to> a plain dict."

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40979>
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