[docs] [issue28644] Document recen changes in typing.py

[Ivan Levkivskyi]

New submission from Ivan Levkivskyi:

Here is the patch with recent additions/changes in typing.py

Summary: Tuple and Callable are now classes, generic type aliases, added Coroutine, extended docs for get_type_hints.

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assignee: docs at python
components: Documentation
files: recent-typing-docs.diff
keywords: patch
messages: 280364
nosy: docs at python, gvanrossum, levkivskyi
priority: normal
severity: normal
status: open
title: Document recen changes in typing.py
type: enhancement
versions: Python 3.5, Python 3.6, Python 3.7
Added file: http://bugs.python.org/file45401/recent-typing-docs.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28644>
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