AP_MotorsMulticopter: fix comment for get_throttle_limit function

libraries/AP_Motors/AP_MotorsMulticopter.h

@@ -75,7 +75,7 @@ public:
     // get_batt_resistance - get battery resistance approximation - for logging purposes only
     float               get_batt_resistance() const { return _batt_resistance; }
 
-    // get throttle limit imposed by battery current limiting.  This is a number from 0 ~ 1 where 0 means hover throttle, 1 means the hover throttle
+    // get throttle limit imposed by battery current limiting.  This is a number from 0 ~ 1 where 0 means hover throttle, 1 means full throttle (i.e. not limited)
     float               get_throttle_limit() const { return _throttle_limit; }
 
     // returns maximum thrust in the range 0 to 1