updated documentation for xtract_hps
updated documentation for xtract_hps

eriser/LibXtract,caseybasichis/LibXtract,caseybasichis/LibXtract,jamiebullock/LibXtract,caseybasichis/LibXtract,jamiebullock/LibXtract,eriser/LibXtract,kecsap/LibXtract,jamiebullock/LibXtract,kecsap/LibXtract,kecsap/LibXtract,eriser/LibXtract