Nope, if not picked up on before the car is delivered then it's classed as a fault, it's on the dealer to fix from this point. Why would it be on the buyer to fix? If the buyer didn't pick up on a slight tick from the engine and it went bang two days later, would you expect the buyer to sort that too?
On a private sale I agree with you, but not when buying from a dealer. To the OP, no harm in printing the instructions off, the dealer may appreciate the heads up, just remember to say that the noise definitely wasn't there when you looked at the car originally.