[docs] [issue37487] PyList_GetItem() document regarding index

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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keywords: +patch
pull_requests: +14437
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/14623

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37487>
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