polygon concept documentation incorrect

[mboedigh]

documentation for 1.78 says that template<> traits::ring_type should be specified, but there is no traits::ring_type template. VS2022 shows the error

error C2039: 'ring_type': is not a member of 'boost::geometry::traits' Should the docs say to specialize boost::geometry::ring_type<>?

I also needed to specialize several other templates not mentioned in the docs. I don't know if this is a complete list, or if there is a simpler way, but this all seems necessary for me to use boost::geometry::intersection(m3::Polygon &, m3::Polygon&, output_container);

template <> struct boost::geometry::traits::point_type <m3::Polygon> {     // this was optional for intersection, but needed for other function templates
using type = m3::Polygon::point_type; 
};
template <>
struct boost::geometry::traits::ring_const_type<m3::Polygon> {
    using type = m3::Polygon::ring_type const &;
};

template <>
struct boost::geometry::traits::ring_mutable_type<m3::Polygon> {
    using type = m3::Polygon::ring_type &;
};
template <>
struct boost::geometry::traits::interior_const_type<m3::Polygon> {
    using type = m3::Polygon::inner_container_type const &;
};

template <>
struct boost::geometry::traits::interior_mutable_type<m3::Polygon> {
    using type = m3::Polygon::inner_container_type &;
};