Indian billionaire Gautam Adani has refuted a report by U.S.-based short-seller Hindenburg Research, saying that it contains “targeted misinformation” aimed at tarnishing the conglomerate’s reputation. The Hindenburg report, published on Jan. 24, accused the Indian conglomerate Adani Group—which is led by Mr. Adani—of engaging in stock manipulation and accounting-fraud schemes over decades. At the company’s…