Rekha Jhunjhunwla, wife of the late Rakesh Jhunjhunwala, the formidable big bull of the desi stock market, lost over Rs 800 crore on Monday. Jhunjhunwala’s folio took a hit as Titan’s shares plummeted more than 5 percent on May 6. The Jhunjhunwala portfolio comprises a 5.3% stake in the Tata Group …