AP_NavEKF3: minor spelling fix

libraries/AP_NavEKF3/AP_NavEKF3_RngBcnFusion.cpp

@@ -24,7 +24,7 @@ void NavEKF3_core::SelectRngBcnFusion()
                 FuseRngBcn();
             } else {
                 // If we are using GPS, then GPS is the primary reference, but we continue to use the beacon data
-                // to calculate an independant position that is used to update the beacon position offset if we need to
+                // to calculate an independent position that is used to update the beacon position offset if we need to
                 // start using beacon data as the primary reference.
                 FuseRngBcnStatic();
                 // record that the beacon origin needs to be initialised