[temp.local] Fix example not to name the constructor. (#1981)

Author: jensmaurer

source/templates.tex

@@ -4461,7 +4461,7 @@
 };
 
 template<class T, template<class> class U = T::template Base> struct Third { };
-Third<Base<int> > t;                    // OK: default argument uses injected-class-name as a template
+Third<Derived<int> > t;                 // OK: default argument uses injected-class-name as a template
 \end{codeblock}
 \end{example}