[docs] [issue18326] Mention 'keyword only' for list.sort, improve glossary.

[Zachary Ware]

Zachary Ware added the comment:

Any further thoughts on this?  I think my vote is for v3, except s/must/can only/.  "must" makes it sound like you are forced to pass those arguments.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18326>
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