asyncio: Fix docs for default event loop (#14308)
When the Windows default event loop changed, `asyncio-policy.rst` was updated but `asyncio-eventloop.rst` was missed.
diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index 8673f84..f763fd5 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -1454,7 +1454,7 @@
:class:`SelectorEventLoop` and :class:`ProactorEventLoop`.
By default asyncio is configured to use :class:`SelectorEventLoop`
-on all platforms.
+on Unix and :class:`ProactorEventLoop` on Windows.
.. class:: SelectorEventLoop