[docs] [issue18529] Use long dash

[Roundup Robot]

Roundup Robot added the comment:

New changeset 01d2c25a6804 by R David Murray in branch 'default':
Use endash in PEP callouts.
http://hg.python.org/cpython/rev/01d2c25a6804

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nosy: +python-dev

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<http://bugs.python.org/issue18529>
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