[docs] [issue16978] fix grammar in 'threading' documentation

[Ezio Melotti]

Ezio Melotti added the comment:

Fixed, thanks for the report and the patch!

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assignee: docs at python -> ezio.melotti
nosy: +ezio.melotti
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed
versions: +Python 3.2, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16978>
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