Copter: rename ESC param to ESC_CALIBRATION

ArduCopter/Parameters.cpp

@@ -353,12 +353,12 @@ const AP_Param::Info Copter::var_info[] PROGMEM = {
     // @User: Standard
     GSCALAR(log_bitmask,    "LOG_BITMASK",          DEFAULT_LOG_BITMASK),
 
-    // @Param: ESC
+    // @Param: ESC_CALIBRATION
     // @DisplayName: ESC Calibration
     // @Description: Controls whether ArduCopter will enter ESC calibration on the next restart.  Do not adjust this parameter manually.
     // @User: Advanced
     // @Values: 0:Normal Start-up, 1:Start-up in ESC Calibration mode if throttle high, 2:Start-up in ESC Calibration mode regardless of throttle, 9:Disabled
-    GSCALAR(esc_calibrate, "ESC",                   0),
+    GSCALAR(esc_calibrate, "ESC_CALIBRATION",       0),
 
     // @Param: TUNE
     // @DisplayName: Channel 6 Tuning