[issue18399] Fix grammar in comment in python.c

[Roundup Robot]

Roundup Robot added the comment:

New changeset c02656962b9c by R David Murray in branch '3.3':
#18399: fix comment typo.
http://hg.python.org/cpython/rev/c02656962b9c

New changeset b583fd54c8d6 by R David Murray in branch 'default':
Merge: #18399: fix comment typo.
http://hg.python.org/cpython/rev/b583fd54c8d6

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nosy: +python-dev

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