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

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

The final commit uses the wrong bpo number:

New changeset bf9d317626eebcf79bd0756b4dd43df82d5cc186 by Yury Selivanov (Tom Floyer) in branch 'master':
bpo-31810: added missing keywords to docs. (#4140)
https://github.com/python/cpython/commit/bf9d317626eebcf79bd0756b4dd43df82d5cc186

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nosy: +haypo

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<https://bugs.python.org/issue31811>
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