[issue43147] Remove mention of "subcontrary mean" from the docs

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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keywords: +patch
pull_requests: +23260
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24462

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43147>
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