[docs] [issue36985] typing.ForwardRef is undocumented

[Anthony Sottile]

New submission from Anthony Sottile <asottile at umich.edu>:

- New since 3.7.0
- is exposed by some public apis:
    - the `__doc__` attribute of `typing` mentions `ForwardRef`
    - `get_type_hints` can expose an instance of it: https://bugs.python.org/issue35834

Should this be documented? including in __all__?

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assignee: docs at python
components: Documentation
messages: 342979
nosy: Anthony Sottile, docs at python
priority: normal
severity: normal
status: open
title: typing.ForwardRef is undocumented
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36985>
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