Add whatsnew for suggest_on_error

Author: savannahostrowski

Doc/whatsnew/3.14.rst

@@ -210,6 +210,12 @@ argparse
   interpreter was instructed to find the ``__main__`` module code.
   (Contributed by Serhiy Storchaka and Alyssa Coghlan in :gh:`66436`.)
 
+* Introduced the optional *suggest_on_error* parameter to 
+  :class:`argparse.ArgumentParser`, enabling suggestions for argument choices 
+  and subparser names if mistyped by the user.
+  (Contributed by Savannah Ostrowski in :gh:`124456`)
+
+
 ast
 ---