[3.13] Remove duplicate "it" in whatsnew 3.13 (GH-121580) (gh-121899)

Author: miss-islington

Doc/whatsnew/3.13.rst

@@ -1929,7 +1929,7 @@ although there is currently no date scheduled for their removal.
 
 * :mod:`xml.etree.ElementTree`: Testing the truth value of an
   :class:`~xml.etree.ElementTree.Element` is deprecated. In a future release it
-  it will always return ``True``. Prefer explicit ``len(elem)`` or
+  will always return ``True``. Prefer explicit ``len(elem)`` or
   ``elem is not None`` tests instead.
 
 * :meth:`zipimport.zipimporter.load_module` is deprecated: