asyncio: Fix docs for default event loop (#14308)

bdarnell · 1st1 · commit 9ffca670ed4d · 2019-06-22T10:38:20.000-07:00
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
@@ -1454,7 +1454,7 @@ asyncio ships with two different event loop implementations:
 :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
