[docs] [issue33082] multiprocessing docs bury very important 'callback=' args

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

These doc changes have been languishing.  We have a difference of opinion about adding a callback example.  I don't have a strong feeling one way or the other.  Davin or anyone else, what say you?

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nosy: +ned.deily

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<https://bugs.python.org/issue33082>
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