By Medha Singh and Sruthi Shankar (Reuters) -U.S. stocks were headed for a lower open on Monday following the S&P 500’s biggest one-day jump in more than a month, with investors shifting their focus to retail earnings this week for clues on the strength of consumer spending. Shares of Discovery Inc jumped 9.0% in premarket trading on plans to merge with U.S. telecoms giant AT&T Inc’s media assets, including CNN and HBO. AT&T shares gained 2%. Wall Street’s main indexes rebounded on Thursday and Friday as investors picked up beaten-down stocks following a pullback earlier in the week on concern…

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