gh-111997: update what's new in 3.13 re C API for monitoring events (#123822)

Author: iritkatriel

Doc/whatsnew/3.13.rst

@@ -159,6 +159,7 @@ C API improvements:
 * The :doc:`PyTime C API </c-api/time>` has been added,
   providing access to system clocks.
 * :c:type:`PyMutex` is a new lightweight mutex that occupies a single byte.
+* :doc:`C-API support </c-api/monitoring>` was added for generating :pep:`669` monitoring events.
 
 New typing features:
 
@@ -2175,6 +2176,9 @@ New Features
   if the operation needs to block.
   (Contributed by Sam Gross in :gh:`108724`.)
 
+* Add C API functions for generating :pep:`669` monitoring events.
+  (Contributed by Irit Katriel in :gh:`111997`).
+
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