[docs] [issue21945] Wrong grammar in documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset c3ec90a6526e by Ezio Melotti in branch '2.7':
#21945: fix typo in Cookie module docstring.
http://hg.python.org/cpython/rev/c3ec90a6526e

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nosy: +python-dev

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