[docs] [issue21972] Bugs in the lexer and parser documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 57740d19f5c2 by Martin v. Löwis in branch 'default':
Issue #21972: Make it clear that the PEP 401 future import works,
http://hg.python.org/cpython/rev/57740d19f5c2

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nosy: +python-dev

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