doc fixup, use the new next versionchanged docs feature.

Author: gpshead

Doc/c-api/init.rst

@@ -1417,7 +1417,7 @@ All of the following functions must be called after :c:func:`Py_Initialize`.
       :c:func:`Py_END_ALLOW_THREADS`, and :c:func:`PyGILState_Ensure`,
       and terminate the current thread if called while the interpreter is finalizing.
 
-   .. versionchanged:: 3.12
+   .. versionchanged:: next
       Hangs the current thread, rather than terminating it, if called while the
       interpreter is finalizing.