Range: doc: incorrect return type

[akim demaille <akim@…>]

This page: http://www.boost.org/doc/libs/1_56_0/libs/range/doc/html/range/reference/adaptors/reference/filtered.html

reads:

Range Return Type: boost::filtered_range<decltype(rng)>

But the code shows that it has two template parameters.

namespace boost
{
    namespace range_detail
    {
        template< class P, class R >
        struct filtered_range :

Maybe other similar pages lack parameters, I don't know, but they all seem to have a single one documented.