[issue28763] Use en-dashes for ranges in docs

[Martin Panter]

Martin Panter added the comment:

My Australian Style Manual says to use en rules for spans of figures etc. Wikipedia mentions some other guides: <https://en.wikipedia.org/wiki/Dash#Ranges_of_values>; apparently some prefer the hyphen. That is why I said it is a style issue, not a black and white thing.

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