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

[Chad]

Chad <millchad at amazon.com> added the comment:

https://github.com/chadmiller-amzn/cpython/pull/1

(Putting that in "GitHub PR" field says "Edit Error: Unknown PR format, acceptable formats are: full github URL, #pr_number, pr_number")

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versions: +Python 3.4, Python 3.5

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