[docs] [issue15270] "Economy of Expression" section outdated

[Roundup Robot]

Roundup Robot added the comment:

New changeset 100909b4def0 by Raymond Hettinger in branch 'default':
Issue #15270.  Appease critics by removing a reference to the docs for super().
http://hg.python.org/devguide/rev/100909b4def0

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nosy: +python-dev

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