By Sinéad Carew and Anisha Sircar (Reuters) – The S&P 500 fell slightly on Tuesday after a three-session rally as volatile trading in oil prices kept soaring inflation in focus and investors reacted to hawkish comments from a Federal Reserve official. Eight of the 11 major S&P 500 sectors were declining and after outperforming earlier in the session, energy lost ground and was last down 0.8% in late afternoon trading as oil prices turned negative. This was after a report that some OPEC members were exploring the idea of suspending Russia’s participation in an oil-production deal, potentially p…