CWG2650 Incorrect example for ill-formed non-type template arguments

Also fixes NB US 28-068 (C++23 CD).

Author: burblebee

source/templates.tex

@@ -7290,9 +7290,11 @@
 \begin{example}
 \begin{codeblock}
 template <class T, T> struct S {};
-template <class T> int f(S<T, T()>*);
-struct X {};
-int i0 = f<X>(0);
+template <class T> int f(S<T, T{}>*);   // \#1
+struct X {
+  int m;
+};
+int i0 = f<X>(0);   // \#1 uses a value of non-structural type \tcode{X} as a non-type template argument
 \end{codeblock}
 \end{example}