[issue29795] Clarify how to share multiprocessing primitives

[Max]

Max added the comment:

How about inserting this text somewhere:

Note that sharing and synchronization objects (such as `Queue()`, `Pipe()`, `Manager()`, `Lock()`, `Semaphore()`) should be made available to a new process by passing them as arguments to the `target` function invoked by the `run()` method. Making these objects visible through global variables will only work when the process was started using `fork` (and as such sacrifices portability for no special benefit).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29795>
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