[docs] [issue12743] C API marshalling doc contains XXX

[Berker Peksag]

Berker Peksag added the comment:

Since 4059e871e74e, PyMarshal_ReadLongFromFile and PyMarshal_ReadShortFromFile can return -1 on error. Return values of those functions were already documented in acb4d43955f6. Some of the usages also check return value of PyErr_Occurred(): https://hg.python.org/cpython/rev/11958c69a4b2#l2.7

I removed the outdated paragraph and add a sentence about using PyErr_Occurred().

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keywords: +patch
nosy: +berker.peksag, haypo
stage: needs patch -> patch review
versions: +Python 3.5, Python 3.6
Added file: http://bugs.python.org/file42555/issue12743.diff

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