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

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +vinay.sajip, xtreak
versions: +Python 3.7, Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28890>
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