[docs] [issue28890] logging.handlers: Document that QueueListener is a daemon thread

[Vinay Sajip]

New submission from Vinay Sajip <vinay_sajip at yahoo.co.uk>:

Why does that particularly need documenting? If it were a non-daemon thread, that might need documenting as the program would have to join() it or else seem to hang, but what does it matter if it's a daemon thread?

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<https://bugs.python.org/issue28890>
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