AP_Proximity: minor comment fix

libraries/AP_Proximity/AP_Proximity_LightWareSF40C_v09.cpp

@@ -56,7 +56,7 @@ float AP_Proximity_LightWareSF40C_v09::distance_min() const
     return 0.20f;
 }
 
-// initialise sensor (returns true if sensor is succesfully initialised)
+// initialise sensor (returns true if sensor is successfully initialised)
 bool AP_Proximity_LightWareSF40C_v09::initialise()
 {
     // set motor direction once per second

libraries/AP_Proximity/AP_Proximity_MAV.h

@@ -25,7 +25,7 @@ public:
 
 private:
 
-    // initialise sensor (returns true if sensor is succesfully initialised)
+    // initialise sensor (returns true if sensor is successfully initialised)
     bool initialise();
 
     // horizontal distance support