[boost] [flat_map] doxygen bug

Hi all The default types for 'Predicate' and 'Allocator' exposed to doxygen in flat_map are incorrect. See below ./flat_map.hpp: #ifdef BOOST_CONTAINER_DOXYGEN_INVOKED template <class Key ,class T ,class Pred = std::less< std::pair< Key, T> > <-- incorrect ,class A = std::allocator<T> > <-- incorrect #else template <class Key, class T, class Pred, class A> #endif class flat_map; ./container_fwd.hpp: template <class Key ,class T ,class Pred = std::less<Key> ,class A = std::allocator<std::pair<Key, T> > > class flat_map;