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

[Yury Selivanov]

Change by Yury Selivanov <yselivanov at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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