The fourth annual SILVERDOCS: AFI/Discovery Channel Documentary Festival came to a close Sunday, with top honors going to Heidi Ewing and Rachel Grady’s Jesus Camp, a fascinating look behind the scenes of an Evangelical Christian movement which molds young children into soldiers for Christ. Ewing and Grady now add a Sterling Feature Grand Jury Award to their previous SILVERDOCS Audience Award, for 2005’s Boys of Baraka. Other award winners include: an Honorable Mention for Chairman…