[docs] [issue33649] asyncio docs overhaul

[Yury Selivanov]

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

The first PR has been just landed.

The plan is to work in 'master' branch and when the docs are ready we backport them to 3.7 in one big PR.

So far the following files were updated/reviewed:

     Doc/library/asyncio-eventloop.rst
     Doc/library/asyncio-eventloops.rst -> Doc/library/asyncio-policy.rst
     Doc/library/asyncio-exceptions.rst
     Doc/library/asyncio-platforms.rst 
     Doc/library/asyncio-policy.rst    
     Doc/library/asyncio-protocol.rst  
     Doc/library/asyncio-queue.rst     
     Doc/library/asyncio-stream.rst    
     Doc/library/asyncio-subprocess.rst 

Please feel free to submit PR to fix/improve the above (but not other files as I'm going to be making some heavy edit passes on them).

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