AP_BoardConfig: improved docs for BRD_SAFETYENABLE

libraries/AP_BoardConfig/AP_BoardConfig.cpp

@@ -71,8 +71,8 @@ const AP_Param::GroupInfo AP_BoardConfig::var_info[] = {
     AP_GROUPINFO("SER2_RTSCTS",    2, AP_BoardConfig, _ser2_rtscts, 2),
 
     // @Param: SAFETYENABLE
-    // @DisplayName:  Enable use of safety arming switch
-    // @Description: Disabling this option will disable the use of the safety switch on PX4 for arming. Use of the safety switch is highly recommended, so you should leave this option set to 1 except in unusual circumstances.
+    // @DisplayName: Enable use of safety arming switch
+    // @Description: This controls the default state of the safety switch at startup. When set to 1 the safety switch will start in the safe state (flashing) at boot. When set to zero the safety switch will start in the unsafe state (solid) at startup. Note that if a safety switch is fitted the user can still control the safety state after startup using the switch. The safety state can also be controlled in software using a MAVLink message.
     // @Values: 0:Disabled,1:Enabled
     // @RebootRequired: True
     AP_GROUPINFO("SAFETYENABLE",   3, AP_BoardConfig, _safety_enable, 1),