docs: Add asyncio source code links (GH-16640)
diff --git a/Doc/library/asyncio-platforms.rst b/Doc/library/asyncio-platforms.rst
index 7e4a70f..390ee19 100644
--- a/Doc/library/asyncio-platforms.rst
+++ b/Doc/library/asyncio-platforms.rst
@@ -23,6 +23,12 @@
Windows
=======
+**Source code:** :source:`Lib/asyncio/proactor_events.py`,
+:source:`Lib/asyncio/windows_events.py`,
+:source:`Lib/asyncio/windows_utils.py`
+
+--------------------------------------
+
.. versionchanged:: 3.8
On Windows, :class:`ProactorEventLoop` is now the default event loop.