NEW YORK: One of Knight Ridder's major shareholders, Southeastern Asset Management, notified the Securities and Exchange Commission (SEC) that it wants to open discussions with the company about a potential sale. Southeastern, based in Memphis, Tenn., filed a SC 13D form relating to 6,585,800 shares of Knight Ridder common stock, constituting 8.9% of the 73,664,308 shares outstanding. Southeastern...