[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:

While documenting encodings, I found two issues: #10778 and #10779.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9738>
_______________________________________