[docs] [issue31811] async and await missing from keyword list in lexical analysis doc

[Tom Floyer]

Tom Floyer <tomfloyer at icloud.com> added the comment:

I've added those keywords to documentation master branch.

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nosy: +tomfloyer
pull_requests: +4104

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31811>
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