pythonGH-109190: Copyedit 3.12 What's New: PEP 669 (pythonGH-109658)

(cherry picked from commit 168c3a8)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Doc/whatsnew/3.12.rst

@@ -321,13 +321,15 @@ per-interpreter GIL, see :source:`Modules/_xxsubinterpretersmodule.c`.
 PEP 669: Low impact monitoring for CPython
 ------------------------------------------
 
-CPython 3.12 now supports the ability to monitor calls,
-returns, lines, exceptions and other events using instrumentation.
+:pep:`669` defines a new :mod:`API <sys.monitoring>` for profilers,
+debuggers, and other tools to monitor events in CPython.
+It covers a wide range of events, including calls,
+returns, lines, exceptions, jumps, and more.
 This means that you only pay for what you use, providing support
 for near-zero overhead debuggers and coverage tools.
-
 See :mod:`sys.monitoring` for details.
 
+(Contributed by Mark Shannon in :gh:`103083`.)
 
 New Features Related to Type Hints
 ==================================