The Chronicle’s Matier & Ross report that Leslie Griffith, who resigned Friday as co-anchor of Channel 2’s “10 O’Clock News,” is buying property in Colorado and has been talking to colleagues about doing a documentary on a subject she knows well: “The state of television news today.” After 20 years at Channel 2, Griffith wanted out for a variety of reasons, according to previous reports, including frustration over the station’s changing newsroom personnel, the pressures of added broadcasts and shorter news stories, and greater news control being exerted by the station’s ownership in Atlanta — plus tensions with longtime co-anchor Dennis Richmond.