[issue21558] Fix a typo in the contextlib docs

[Raymond Hettinger]

Raymond Hettinger added the comment:

Berker, feel free to assign all these micro-doc fixes to me.   Also, if you want to combine a number of clear-cut, non-controversial fixes into just one patch and tracker item, that might save us both some time.

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assignee: docs at python -> rhettinger
nosy: +rhettinger

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