[docs] [issue17208] add note/warning about daemon threads

[Tim Golden]

Tim Golden added the comment:

+1 This is essentially the answer to the naive user's question:

"Why would anyone *not* use daemon threads given that they're less
hassle to manage?"

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nosy: +tim.golden

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17208>
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