Kyle Stanley 2b201369b4 Fix asyncio.to_thread() documented return type (GH-20547) ...

When I wrote the documentation for `asyncio.to_thread()`, I mistakenly assumed that `return await loop.run_in_executor(...)` within an async def function would return a Future. In reality, it returns a coroutine.

This likely won't affect typical usage of `asyncio.to_thread()`, but it's important for the documentation to be correct here. In general, we also tend to avoid returning futures from high-level APIs in asyncio.

2020-05-31 00:07:04 -07:00

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