[docs] [issue11625] Typo in collections.abc docs

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset a56cd7aeac5e by Raymond Hettinger in branch '2.7':
Issue #11625: Fix Typo
http://hg.python.org/cpython/rev/a56cd7aeac5e

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nosy: +python-dev

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