The exact numbers for the restructure of Billy Turner and the extension of Aaron Jones have not yet been made public. It has also been reported by Tom Silverstein that the Packers intend to extend the contract of Zadarious Smith so they can lower his $22 million salary cap charge.
Although there is a rule prohibiting more than one renegotiation per year for each player, the short answer as what is a renegotiation is that it involves an increase in compensation. That means that the Packers can ask a player who has already either just moved money around or has taken a pay cut to take another pay cut this summer.