Copter: correct TERRAIN_FOLLOW parameter comments

ArduCopter/Parameters.cpp

@@ -963,7 +963,7 @@ const AP_Param::Info Copter::var_info[] = {
     // @Param: TERRAIN_FOLLOW
     // @DisplayName: Terrain Following use control
     // @Description: This enables terrain following for RTL and LAND flight modes. To use this option TERRAIN_ENABLE must be 1 and the GCS must  support sending terrain data to the aircraft.  In RTL the RTL_ALT will be considered a height above the terrain.  In LAND mode the vehicle will slow to LAND_SPEED 10m above terrain (instead of 10m above home).  This parameter does not affect AUTO and Guided which use a per-command flag to determine if the height is above-home, absolute or above-terrain.
-    // @Values: 0:Do Not Use in RTL and Land 1:Use in RTL and Land
+    // @Values: 0:Do Not Use in RTL and Land,1:Use in RTL and Land
     // @User: Standard
     GSCALAR(terrain_follow, "TERRAIN_FOLLOW", 0),