Worth noting on TV

SUNDAY HBO: The Far Pavilions (8-10 p.m.; also Monday and Tuesday) Pay-TV dramatization of M.M. Kaye best seller (please see preview in today's ''On TV''). PBS: Nancy Astor (9-10 p.m.) Second in eight-part ''Masterpiece Theatre'' miniseries about this controversial Virginia-born member of Parliament (Please see preview in the April 13 Arts & Leisure section).. MONDAY PBS: Two Gentlemen From Verona (8-10:30 p.m.) ''Shakespeare Plays'' series continues with lively version of love vs. friendship. TUESDAY PBS: City News (9-10 p.m.) Irreverent American Playhouse comedy about a struggling alternative newspaper.