[docs] [issue18981] Typo in the ctypes tests

[Roundup Robot]

Roundup Robot added the comment:

New changeset b90ba60c5029 by Ezio Melotti in branch '2.7':
#18981: fix a typo in a comment (noticed by Anoop Thomas Mathew).
http://hg.python.org/cpython/rev/b90ba60c5029

New changeset 9fcb9deb70f5 by Ezio Melotti in branch '3.3':
#18981: fix a typo in a comment (noticed by Anoop Thomas Mathew).
http://hg.python.org/cpython/rev/9fcb9deb70f5

New changeset dae3e64e1743 by Ezio Melotti in branch 'default':
#18981: merge with 3.3.
http://hg.python.org/cpython/rev/dae3e64e1743

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nosy: +python-dev

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