DoorDash reported higher-than-expected orders and revenue in the third quarter but warned investors that it will be spending significantly more on product development next year. The San Francisco-based delivery company said Wednesday its total orders rose 21% to 776 million in the July-September period. That beat Wall Street’s forecast of 770 million, according to analysts polled by FactSet. DoorDash said its revenue jumped 27% to $3.45 billion. That also beat analysts’ forecasts of $3.35