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

[Ville Skyttä]

Ville Skyttä added the comment:

codecs-doc-3 contains a versionadded note about us-ascii. I think that's the only end user visible change in the new implementation.

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Added file: http://bugs.python.org/file45085/codecs-doc-3.patch

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