[temp.constr.op] Add reference to [temp.constr.atomic] in example added for US111

Author: Dawn Perchik

source/templates.tex

@@ -1570,7 +1570,8 @@
 
   template <class T> int f1(T) requires (!sad<T>);
   template <class T> int f1(T) requires (!sad<T>) && true;
-  int i1 = f1(42);      // ambiguous, \tcode{!sad<T>} atomic constraint expressions are not formed from the same \grammarterm{expression}
+  int i1 = f1(42);      // ambiguous, \tcode{!sad<T>} atomic constraint expressions\iref{temp.constr.atomic}
+                        // are not formed from the same \grammarterm{expression}
 
   template <class T> concept not_sad = !sad<T>;
   template <class T> int f2(T) requires not_sad<T>;