[docs] [issue33649] asyncio docs overhaul

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:


New changeset b042cf10c6084d14279c55a7e0d2d7595ff4e694 by Yury Selivanov in branch 'master':
bpo-33649: Fix markup; add another note that asyncio.run is 3.7+ (GH-9389)
https://github.com/python/cpython/commit/b042cf10c6084d14279c55a7e0d2d7595ff4e694


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<https://bugs.python.org/issue33649>
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