added small hint

src/main/java/frc/robot/subsystems/XRPDrivetrain.java

@@ -47,6 +47,7 @@ public void arcadeDrive(double xaxisSpeed, double zaxisRotate) {
 
   //TODO:Task 2-Write a function that makes the robot take in a left wheel speed and a right wheel speed, and move at those speeds.
   //HINT:This is called a tank drive, maybe there is a function that can easily allow for it?
+  //HINT:To see all the functions that the drivetrain has, type "m_diffDrive." without the quotes and look at the options generated by auto complete.
 
   public void resetEncoders() {
     m_leftEncoder.reset();