By Devik Jain and Mehnaz Yasmin (Reuters) – U.S. stock indexes slipped in choppy trading on Tuesday as investors digested Target Corp’s gloomy margin forecast that spooked the retail sector, while awaiting inflation data due later this week. Shares of Target slid 4.3% as the big-box retailer said it would have to offer deeper discounts and cut back on stocking discretionary items. The weak outlook weighed on other retail stocks, with main rival and Dow component Walmart Inc falling 2%. Dollar General, Costco, Home Depot and Best Buy Co Inc fell between 0.4% and 2.3%. “While Q2 margins are goin…