Sub: Fix typo in defines.h

ArduSub/defines.h

@@ -157,7 +157,8 @@ enum tuning_func {
     TUNING_DECLINATION =                38, // compass declination in radians
     TUNING_CIRCLE_RATE =                39, // circle turn rate in degrees (hard coded to about 45 degrees in either direction)
     TUNING_ACRO_YAW_KP =                40, // acro controller's P term.  converts pilot input to a desired roll, pitch or yaw rate
-	TUNING_RANGEFINDER_GAIN =           41, // rangefinder gain     TUNING_EKF_VERTICAL_POS =           42, // EKF's baro vs accel (higher rely on accels more, baro impact is reduced).  Range should be 0.2 ~ 4.0?  2.0 is default
+	TUNING_RANGEFINDER_GAIN =           41, // rangefinder gain
+	TUNING_EKF_VERTICAL_POS =           42, // EKF's baro vs accel (higher rely on accels more, baro impact is reduced).  Range should be 0.2 ~ 4.0?  2.0 is default
     TUNING_EKF_HORIZONTAL_POS =         43, // EKF's gps vs accel (higher rely on accels more, gps impact is reduced).  Range should be 1.0 ~ 3.0?  1.5 is default
     TUNING_EKF_ACCEL_NOISE =            44, // EKF's accel noise (lower means trust accels more, gps & baro less).  Range should be 0.02 ~ 0.5  0.5 is default (but very robust at that level)
     TUNING_RC_FEEL_RP =                 45, // roll-pitch input smoothing