Delete duplicate ref

Author: hugovk

Doc/whatsnew/3.15.rst

@@ -2604,8 +2604,6 @@ Build changes
   and :option:`-X dev <-X>` is passed to the Python or Python is built in :ref:`debug mode <debug-build>`.
   (Contributed by Donghee Na in :gh:`141770`.)
 
-.. _whatsnew315-frame-pointers:
-
 * CPython is now built with frame pointers enabled by default
   (:pep:`831`). Pass :option:`--without-frame-pointers` to opt out.