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

[Zachary Ware]

Zachary Ware added the comment:

How about a combination of the two?  It's still short, but gets the point across without assuming the reader knows exactly what 'keyword-only argument' or requiring further reading, while introducing the term and providing the link for deeper understanding.

(Here's the relevant change in this patch, the rest is the same:)

+      :meth:`sort` accepts two arguments that must be passed by keyword
+      (:ref:`keyword-only arguments <keyword-only_parameter>`):

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Added file: http://bugs.python.org/file31440/issue18326.v3.diff

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