Man pages matching name function::sock_fam_num2str in section 3stap:

function::sock_fam_num2str.3stap.en	debian 10 / systemtap-doc
function::sock_fam_num2str.3stap.en	debian 11 / systemtap-doc
function::sock_fam_num2str.3stap.en	debian 12 / systemtap-doc