[issue38557] PyTuple_GetSlice docs minor inaccuracy

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +16455
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16925

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<https://bugs.python.org/issue38557>
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