gh-109975: Remove dangling angle bracket from 3.13.rst (#123589)

Remove dangling angle bracket from 3.13.rst

Author: rffontenelle

Doc/whatsnew/3.13.rst

@@ -966,7 +966,7 @@ io
   the :meth:`~io.IOBase.close` method with :data:`sys.unraisablehook`.
   Previously, errors were ignored silently by default,
   and only logged in :ref:`Python Development Mode <devmode>`
-  or when using a :ref:`<Python debug build <debug-build>`.
+  or when using a :ref:`Python debug build <debug-build>`.
   (Contributed by Victor Stinner in :gh:`62948`.)