[issue41584] Clarify documentation for binary arithmetic operation subclass __r*__ precedence

[Brett Cannon]

Change by Brett Cannon <brett at python.org>:


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keywords: +patch
pull_requests: +21516
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/22505

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41584>
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