Atlanta’s mayor and Falcons owner Arthur Blank have agreed to financing terms for a new $1 billion, retractable-roof stadium to replace the 20-year-old Georgia Dome and keep the team’s home games in the city’s downtown.Mayor Kasim Reed said the city would provide $200 million of construction costs through bonds backed by the city’s hotel-motel tax. The Falcons franchise, owned by Home Depot co-founder Arthur Blank, would provide $800 million and be responsible for construction cost overruns.Briefly • Broncos: Defensive end Elvis Dumervil, who signed a six-year, $61.5 million contract in 2010, is being asked to take a pay cut or restructure his contract to create more salary cap room. • Chargers: Linebacker Takeo Spikes, a 15-year veteran due to earn $3 million, was cut after two seasons in San Diego. • Giants: Cornerback Corey Webster took a $3 million pay cut and center David Baas restructured his five-year contract to reduce his 2013 base pay to $1.25 million. Webster will still earn $4 million this season and Baas $4.25 million. • Bengals: Running back and special teams standout Cedric Peerman agreed to a two-year deal to stay in Cincinnati. • Titans: Rob Brionas, the third most accurate kicker in NFL history, agreed to a two-year deal with Tennessee. Defensive end Keyunta Dawson was also kept off the free agent market by signing a one-year deal. • Colts: Center Jeff Saturday, who spent his first 13 seasons in Indianapolis before playing 2012 with Green Bay, signed a one-day contract and retired as a Colts player. • Rams: After spending the first nine years of his career in St. Louis, running back Steven Jackson voided the final year of his contract and will test free agency.