[doc] Fix typo in asyncio Event Loop (GH-27377)


First Pull Request to cpython, so forgive me for any mistakes

Automerge-Triggered-By: GH:Mariatta
(cherry picked from commit 6fa4060b86a116dc4fb69356795faf6ff1cdde58)

Co-authored-by: Vinicius Gubiani Ferreira <vini.g.fer@gmail.com>
1 file changed