[docs] [issue28763] Use en-dashes for ranges in docs

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thanks Terry.

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resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed
versions: +Python 2.7, Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28763>
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