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

[Ezio Melotti]

Ezio Melotti added the comment:

"keyword-only" is a well-established term, and I think it's better to use it and possibly make it a link to the "parameter" entry of the glossary.

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nosy: +ezio.melotti
stage: needs patch -> patch review

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