[docs] [issue17166] Fix the suggested usage of _dummy_thread module

[R. David Murray]

R. David Murray added the comment:

Thanks, Berker.

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nosy: +r.david.murray
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17166>
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