[issue39671] Mention in docs that asyncio.FIRST_COMPLETED does not guarantee the completion of no more than one task

[Karthikeyan Singaravelan]

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


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components: +asyncio
nosy: +asvetlov, yselivanov

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39671>
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