Each clause contains one or several "Headers <....> synopsis" chapters that define what is defined in the given header.

But for the algorithms library, chapter 25.5 Algorithm result types [algorithms.results] defines additional classes not in the 25.4 Header <algorithm> synopsis [algorithm.syn] chapter.

Affected classes are (non exhaustive list, based on latest draft release N4861):

namespace std::ranges {
    template<class I, class F> struct in_fun_result;
    template<class I1, class I2> struct in_in_result;
    template<class I, class O> struct in_out_result;
    template<class I1, class I2, class O> struct in_in_out_result;
    template<class I, class O1, class O2> struct in_out_out_result;
    template<class T> struct min_max_result;
    template<class I> struct in_found_result;
}

I think that, for coherency with other library headers, these chapters ([algorithms.results] and [algorithm.syn]) should be somehow merged together.