[docs] [issue22476] asyncio task chapter confusion about 'task', 'future', and 'schedule'

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +giampaolo.rodola, gvanrossum, haypo, pitrou, yselivanov

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22476>
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