[issue4260] Document that ctypes.xFUNCTYPE are decorators.

[Andrés Delfino]

Change by Andrés Delfino <adelfino at gmail.com>:


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nosy: +amaury.forgeotdarc, belopolsky, meador.inge

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue4260>
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