asyncio code uses "sys.platform == 'win32'" to detect OS.
asyncio docs use both os.name and sys.platform.

As far as I can tell there is no *practical* difference
between "os.name == 'nt" and "sys.platform == 'win32'"
for choosing asyncio.ProactorEventLoop()

I've attached a patch that replaces all os.name occurrences
in asyncio docs with sys.platform.