Update Doc/whatsnew/3.15.rst

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>

Author: Yashp002

Doc/whatsnew/3.15.rst

@@ -741,7 +741,6 @@ symtable
 --------
 
 * Add :meth:`symtable.Function.get_cells` and :meth:`symtable.Symbol.is_cell` methods.
-
   (Contributed by Yashp002 in :gh:`143504`.)