[3.13] gh-86513: improve docs of loop.call_exception_handler (GH-132466) (#132487)

gh-86513: improve docs of loop.call_exception_handler (GH-132466)
(cherry picked from commit ce75351)

Co-authored-by: Kumar Aditya <[email protected]>

Author: miss-islington

Doc/library/asyncio-eventloop.rst

@@ -1427,6 +1427,8 @@ Allows customizing how exceptions are handled in the event loop.
    * 'protocol' (optional): :ref:`Protocol <asyncio-protocol>` instance;
    * 'transport' (optional): :ref:`Transport <asyncio-transport>` instance;
    * 'socket' (optional): :class:`socket.socket` instance;
+   * 'source_traceback' (optional): Traceback of the source;
+   * 'handle_traceback' (optional): Traceback of the handle;
    * 'asyncgen' (optional): Asynchronous generator that caused
                             the exception.
 

Lib/asyncio/base_events.py

@@ -1877,6 +1877,8 @@ def call_exception_handler(self, context):
         - 'protocol' (optional): Protocol instance;
         - 'transport' (optional): Transport instance;
         - 'socket' (optional): Socket instance;
+        - 'source_traceback' (optional): Traceback of the source;
+        - 'handle_traceback' (optional): Traceback of the handle;
         - 'asyncgen' (optional): Asynchronous generator that caused
                                  the exception.