gh-121249: add news about struct module

Author: skirpichev

Doc/whatsnew/3.14.rst

@@ -904,6 +904,15 @@ ssl
   (Contributed by Will Childs-Klein in :gh:`128036`.)
 
 
+struct
+------
+
+* Support the :c:expr:`float complex` and :c:expr:`double complex` C types in
+  the :mod:`struct` module (formatting characters `'E'` and `'C'`,
+  respectively) if the compiler has C11 complex arithmetic.
+  (Contributed by Sergey B Kirpichev in :gh:`121613`.)
+
+
 symtable
 --------