[issue17166] Fix the suggested usage of _dummy_thread module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6af3afbc7211 by R David Murray in branch '3.2':
#17166: fix _dummy_thread import example.
http://hg.python.org/cpython/rev/6af3afbc7211

New changeset dfefae8df4f7 by R David Murray in branch '3.3':
Merge: #17166: fix _dummy_thread import example.
http://hg.python.org/cpython/rev/dfefae8df4f7

New changeset c4512797b879 by R David Murray in branch 'default':
Merge: #17166: fix _dummy_thread import example.
http://hg.python.org/cpython/rev/c4512797b879

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nosy: +python-dev

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<http://bugs.python.org/issue17166>
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