docs/asyncio: Twek sections names per Nick Coghlan suggestion
diff --git a/Doc/library/asyncio-protocol.rst b/Doc/library/asyncio-protocol.rst
index 78faeae..f9298b2 100644
--- a/Doc/library/asyncio-protocol.rst
+++ b/Doc/library/asyncio-protocol.rst
@@ -1,8 +1,8 @@
.. currentmodule:: asyncio
-+++++++++++++++++++++++++++++++++++++++++
-Transports and protocols (low-level API)
-+++++++++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++++++++++++++
+Transports and protocols (callback based API)
+++++++++++++++++++++++++++++++++++++++++++++++
.. _asyncio-transport: