[docs] [issue25501] Use async/await through asyncio docs

[Guido van Rossum]

Guido van Rossum added the comment:

Honestly I think it's better if most people keep using coroutine/yield-from instead of async/await for a few more releases; their code will be more portable, since it takes forever to update old datacenters. We put in async/await with an eye towards the future. But we're keeping yield-from around for a long time too. And that's also why we support asyncio for 3.3.

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