added comment for cado_poly_getm() with multiple polynomials
added comment for cado_poly_getm() with multiple polynomials

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs