[docs] [issue13604] update PEP 393 (match implementation)

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> Why is the utf-8 representation not cached when it is generated for
> ParseTuple et alia?

It is.

> When a string is created from a wchar_t array, who is responsible for
> releasing the original wchar_t array?

The caller.

> As I read it now, Python
> doesn't release the buffer, and the caller can't because maybe Python
> just pointed to it as memory shared with the canonical
> representation.

But Python won't; it will always make a copy for itself.

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