[docs] [issue12709] In multiprocessing, error_callback isn't documented for map_async

[Petri Lehtinen]

Petri Lehtinen <petri at digip.org> added the comment:

Sandro: The error_callback parameter is not available on 2.7. See #13147.

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nosy: +petri.lehtinen

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<http://bugs.python.org/issue12709>
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