fix typo in inventor example
@@ -36,7 +36,7 @@ POS_KD = 0.0022 # Position derivative (D) gain
# Create a new Inventor2040W and get a motor and encoder from it
-board = Inventor2040W(motor_rear_ratio=GEAR_RATIO)
+board = Inventor2040W(motor_gear_ratio=GEAR_RATIO)
m = board.motors[MOTOR_A]
enc = board.encoders[MOTOR_A]
