Improve asyncio.loop.call_soon() documentation (GH-20883)
* Add a glossary entry for the term "callback"
* Link to it in loop.call_soon() and in the "Concurrency and Multithreading" section
Co-authored-by: Kyle Stanley <aeros167@gmail.com>
diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index d60a6ce..b1e7318 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -191,8 +191,8 @@
.. method:: loop.call_soon(callback, *args, context=None)
- Schedule a *callback* to be called with *args* arguments at
- the next iteration of the event loop.
+ Schedule the *callback* :term:`callback` to be called with
+ *args* arguments at the next iteration of the event loop.
Callbacks are called in the order in which they are registered.
Each callback will be called exactly once.