Revert "Fix a code snippet typo in asyncio docs (#108427)" (GH-111271)

This reverts commit 7f316763402a7d5556deecc3acd06cb719e189b3.

The change resulted in a tautology and should not have been made.  There
may be an opportunity for additional clarity in this section, but this
change wasn't it :)

Ref: https://github.com/python/cpython/pull/108427#issuecomment-1777525740