[docs] [issue9738] Document the encoding of functions bytes arguments of the C API

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

#6543 changed the encoding of the filename argument of PyRun_SimpleFileExFlags() (and all functions based on PyRun_SimpleFileExFlags) and c_filename attribute of the compiler (private) structure in Python 3.1.3: use utf-8 in strict mode instead of filesystem encoding with surrogateescape.

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<http://bugs.python.org/issue9738>
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