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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Sorry, yes, I meant en-dashes of course. I read this recommendation in many books about TeX, and also in other typographic resources. In modern fonts a hyphen-minus (U+002D) is shorter than digits in modern fonts and is placed lower than the middle of digits. An en-dash (U+2013) has the same width as digits and is placed higher, at the middle of digit's height.

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