[docs] PyImport_ExecCodeModuleWithPathnames documentation is wrong

[Florian Link]

Hi,

the PyImport_ExecCodeModuleWithPathnames documentation states that the 
char* strings should be encoded in UTF-8.

But looking at the Python C code, it is aparent that 
PyUnicode_DecodeFSDefault is used to convert these string, so the 
documentation need to state the the string should be encoded as in the 
default of the local filesystem.

https://docs.python.org/3/c-api/import.html#c.PyImport_ExecCodeModuleWithPathnames

regards,
Florian

P.S. I ran into this because I passed in UTF-8 and the __file__ 
attribute of the imported modules was wrong afterwards.

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Florian Link
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