METRO DIGEST
A BOY'S WISH GROWS ON ITS OWN A very sick little boy recovered, but his request for cards lives on through a flurry of chain letters making the rounds of offices in Manhattan and other cities around the country. And as thousands of cards continue to pour in, those who publicized the boy's appeal have replaced "Thank you" with "Enough already." A1. COSTLY CABLE-RATE REDUCTION Cable television rates change under Federal formulas intended to save consumers more than $1 billion a year. But some cable customers in the New York metropolitan region are discovering that their bills are going up, not down. A1.