This wide-eyed brunette comic "speaks softly and carries a big shtick" through an act that combines shrewd observations about life and the world with a soubrette's voice and a demeanor that makes one want to help her across the street. Rita Rudner has conquered the stand-up stage and expanded into writing and performing in films produced by her husband, Martin Bergman.An only child, Rudner graduated from high school in 1971 and by the following year had convinced her father to let her move from the Miami, FL, area to NYC in order to pursue a career as a dancer. It took three years, but Rudner