[docs] [issue25073] Document asyncio.test_utils

[Yury Selivanov]

Yury Selivanov added the comment:

> Agreed, but then why isn't it in the tests directory?

I think that the main reason is to make it possible for tests to import some common functionality from 'asyncio' package, when you run them from the cloned github asyncio repo.

In fact, I think we should prefix the module with an underscore.

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