[docs] [issue25438] document what codec PyMemberDef T_STRING decodes the char * as

[Windson Yang]

Change by Windson Yang <wiwindson at outlook.com>:


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keywords: +patch
pull_requests: +9824
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25438>
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