Rebecca Rubin Film and Media ReporterIn perhaps the biggest news from Amazon this week, the studio has acquired a new documentary about the life and times of Val Kilmer.(We kid; the top story is its pending acquisition of MGM.) But “Val,” a chronicle of the method actor behind “The Doors” and “Top Gun,” also ranks as a buzzy purchase as Amazon makes moves to compete in the streaming wars.Amazon Studios will release the documentary later this year in the U.S. and Latin America.