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

Chad <millchad@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") ---------- versions: +Python 3.4, Python 3.5 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue33082> _______________________________________