[docs] [issue28094] Document behaviour of Process.join() in multiprocessing

[Tom Clark]

Tom Clark added the comment:

I thought that, since Issue <10673> refers to the library rather than the docs, it was better to create a seperate documentation issue.  In other words, I probably overthought it.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28094>
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