Improve the Py_REFCNT() documentation for 3.14.

Author: ZeroIntensity

Doc/c-api/refcounting.rst

@@ -19,7 +19,7 @@ of Python objects.
    references to the object are actually held.  For example, some
    objects are :term:`immortal` and have a very high refcount that does not
    reflect the actual number of references.  Consequently, do not rely
-   on the returned value to be accurate, other than a value of 0 or 1.
+   on the returned value to be accurate.
 
    Use the :c:func:`Py_SET_REFCNT()` function to set an object reference count.
 
@@ -38,6 +38,12 @@ of Python objects.
    .. versionchanged:: 3.11
       The parameter type is no longer :c:expr:`const PyObject*`.
 
+   .. versionchanged:: 3.14
+      The interpreter now uses :term:`borrowed references <borrowed reference>`
+      where possible when calling C extensions. This means that an object's
+      reference count may appear as 1, even when it is not solely referenced by
+      the caller.
+
 
 .. c:function:: void Py_SET_REFCNT(PyObject *o, Py_ssize_t refcnt)