DoorDash (DASH) stock wavered late Wednesday after the food-delivery company's second-quarter earnings slightly missed estimates, despite easily beating revenue forecasts. For the June-ended quarter, DoorDash earned 46 cents per share, down 29% from a year earlier. That missed the 47 cents per-share earnings that analysts polled by FactSet were forecasting. Sales increased 36% to $4.5 billion, easily beating analyst estimates…