clarified tune_parameters for Doxygen comments
clarified tune_parameters for Doxygen comments

ilyaraz/falconn_polygon,ilyaraz/FALCONN,FALCONN-LIB/FALCONN,FALCONN-LIB/FALCONN,ilyaraz/FALCONN,FALCONN-LIB/FALCONN,ilyaraz/FALCONN,ilyaraz/FALCONN,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,ilyaraz/falconn_polygon,ilyaraz/falconn_polygon