asyncio.wait documentation on non-emptiness requirement lost in bpo-33649

BPO	40499
Nosy	@gvanrossum, @jrosdahl
PRs	bpo-40499: Mention that asyncio.wait() needs a non-empty aws set #19900

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-05-04.21:56:50.975>
created_at = <Date 2020-05-04.12:16:17.532>
labels = ['3.7', '3.8', '3.9', 'docs']
title = 'asyncio.wait documentation on non-emptiness requirement lost in bpo-33649'
updated_at = <Date 2020-05-04.21:56:50.975>
user = 'https://bugs.python.org/JoelRosdahl'

bugs.python.org fields:

activity = <Date 2020-05-04.21:56:50.975>
actor = 'gvanrossum'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-05-04.21:56:50.975>
closer = 'gvanrossum'
components = ['Documentation']
creation = <Date 2020-05-04.12:16:17.532>
creator = 'Joel Rosdahl'
dependencies = []
files = []
hgrepos = []
issue_num = 40499
keywords = ['patch']
message_count = 2.0
messages = ['368041', '368091']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'jrosdahl', 'docs@python', 'Joel Rosdahl']
pr_nums = ['19900']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40499'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']