[issue43896] Update the Sphinx directive for super from function to class

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

I've applied this PR but still am not sure that it makes readers better-off.

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resolution:  -> fixed
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43896>
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