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

[Ezio Melotti]

Ezio Melotti added the comment:

While you are at it, have you checked how many en-dashes have been used instead of em-dashes?  "--" is commonly used to indicate em-dashes (e.g. in emails), but in rst it renders to an en-dash.

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nosy: +ezio.melotti

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<http://bugs.python.org/issue28763>
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