(In Aug. 5 story, corrects paragraph 3 to remove reference to Peltz's demand of P&G shifting its Cincinnati headquarters, and changes wording to "reorganisation" from "break-up") Aug 5 (Reuters) - Procter & Gamble Co said on Thursday activist investor Nelson Peltz would step down from the company's board at the end of his term later this year. The consumer goods giant appointed the founder of Trian Fund Management to its board in 2018, following a bitter months-long proxy fight - the biggest ever involving a U.S. company at the time.