[functional.syn] Tweak cross-references in class synopsis

Author: tkoeppe

source/utilities.tex

@@ -10636,16 +10636,18 @@
     constexpr @\unspec@ mem_fn(R T::*) noexcept;                                  // freestanding
 
   // \ref{func.wrap}, polymorphic function wrappers
+  // \ref{func.wrap.badcall}, class \tcode{bad_function_call}
   class bad_function_call;
 
+  // \ref{func.wrap.func}, class template \tcode{function}
   template<class> class function;       // \notdef
   template<class R, class... ArgTypes> class function<R(ArgTypes...)>;
 
-  // \ref{func.wrap.func.alg}, specialized algorithms
+  // \ref{func.wrap.func.alg}, \tcode{function} specialized algorithms
   template<class R, class... ArgTypes>
     void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&) noexcept;
 
-  // \ref{func.wrap.func.nullptr}, null pointer comparison operator functions
+  // \ref{func.wrap.func.nullptr}, \tcode{function} null pointer comparison operator functions
   template<class R, class... ArgTypes>
     bool operator==(const function<R(ArgTypes...)>&, nullptr_t) noexcept;