[3.12] GH-101291: Add warning to "what's new" that PyLongObject int…

…ernals have changed. (GH-107388) (#107392)

(cherry picked from commit 1ee605c)

Co-authored-by: Mark Shannon <mark@hotpy.org>

Doc/whatsnew/3.12.rst

@@ -1867,6 +1867,17 @@ Porting to Python 3.12
  subinterpreter that they don't support (or haven't yet been loaded in). See
  :gh:`104668` for more info.
 
+* :c:struct:`PyLongObject` has had its internals changed for better performance.
+ Although the internals of :c:struct:`PyLongObject` are private, they are used
+ by some extension modules.
+ The internal fields should no longer be accessed directly, instead the API
+ functions beginning ``PyLong_...`` should be used instead.
+ Two new *unstable* API functions are provided for efficient access to the
+ value of :c:struct:`PyLongObject`\s which fit into a single machine word:
+
+ * :c:func:`PyUnstable_Long_IsCompact`
+ * :c:func:`PyUnstable_Long_CompactValue`
+
 Deprecated
 ----------