(Reuters) - Kraft Heinz Co will spend more on marketing for key brands widely thought to have been neglected after reporting on Thursday that lower costs helped it beat third-quarter profit expectations, sending shares up 13% in midday trading. Having booked billions of dollars in writedowns this year on the value of some of its most well-known brands, including bacon and cold-cuts maker Oscar Mayer, Kraft Heinz has been criticized for gutting spending on brands under a chief executive..