[issue41688] Document how **= does not fall back on **

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +21243
pull_request: https://github.com/python/cpython/pull/22175

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41688>
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