[issue21558] Fix a typo in the contextlib docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset ebeade01bd8e by Raymond Hettinger in branch '3.4':
Issue 21558:  Fix a typo in the contextlib docs
http://hg.python.org/cpython/rev/ebeade01bd8e

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21558>
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