[issue33260] Update token.py etc for ASYNC and AWAIT

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

After making 'async' and 'await' proper keywords (issue30406), token.py was not regenerated. The proposed patch updates token.py, tokenize.py and the documentation.

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components: Library (Lib)
messages: 315184
nosy: serhiy.storchaka
priority: normal
severity: normal
status: open
title: Update token.py etc for ASYNC and AWAIT
type: behavior
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33260>
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