[docs] [issue28393] Update encoding lookup docs wrt #27938

[Ville Skyttä]

Ville Skyttä <ville.skytta at iki.fi> added the comment:

I'm getting a 500 internatl server error trying to update https://bugs.python.org/review/28393/, so noting here that the latest review issue has been addressed in https://github.com/python/cpython/pull/4871

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<https://bugs.python.org/issue28393>
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