gh-149694: Fix missing docstring on asyncio.iscoroutinefunction

[deadlovelll]

gh-149694: Fix missing docstring on asyncio.iscoroutinefunction

The docstring in asyncio.iscoroutinefunction is currently dead code: it follows an import warnings statement, so Python does not treat it as docstring.

Before:

  >>> import asyncio
  >>> asyncio.iscoroutinefunction.__doc__ is None
  True

After:

  >>> asyncio.iscoroutinefunction.__doc__
  'Return True if func is a decorated coroutine function.'

The fix is a one-line reorder: move import warnings below the docstring.

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[picnixz]

We are in the process of removing this function. So, this PR should be opened against 3.15 instead (I'm closing it because it's easier to recreate a branch from 3.15 rather than rebasing)

[deadlovelll]

We are in the process of removing this function. So, this PR should be opened against 3.15 instead (I'm closing it because it's easier to recreate a branch from 3.15 rather than rebasing)

Okay, i'll recreate this for 3.15