Mumbai, Sept. 5 -- The Securities and Exchange Board of India (SEBI) has approved the initial public offering (IPO) of the National Stock Exchange of India Ltd (NSE), clearing the way for the bourse to begin the final steps for its long-awaited listing in the stock market. The markets regulator issued its observation to the exchange's potential Rs.30,000 crore offer in the week ending September 4, a notification on the SEBI website showed on Friday. The NSE IPO clearance follows SEBI's approval of Jio Platforms Ltd's potential Rs.35,000 crore IPO last week, thus paving the way for back-to-back listings of two of the country's biggest offerings so far. Mint had reported on 14 August that the Ashish Chauhan-led firm was targeting a mid-Septem...