BoardConfig: fix description for SLCAN parameters

libraries/AP_BoardConfig/canbus_slcan.cpp

@@ -29,16 +29,14 @@ const AP_Param::GroupInfo AP_BoardConfig_CAN::SLCAN_Interface::var_info[] = {
 
     // @Param: SERNUM
     // @DisplayName: SLCAN Serial Port
-    // @Description: Serial Port ID to be used for temporary SLCAN iface, -1 means no temporary serial
+    // @Description: Serial Port ID to be used for temporary SLCAN iface, -1 means no temporary serial. This parameter is automatically reset on reboot or on timeout. See CAN_SLCAN_TIMOUT for timeout details
     // @Values: -1:Disabled,0:Serial0,1:Serial1,2:Serial2,3:Serial3,4:Serial4,5:Serial5,6:Serial6
     // @User: Standard
-    // @RebootRequired: True
     AP_GROUPINFO("SERNUM", 2, AP_BoardConfig_CAN::SLCAN_Interface, _ser_port, -1),
 
-
     // @Param: TIMOUT
     // @DisplayName: SLCAN Timeout
-    // @Description: Duration of inactivity after which SLCAN in seconds
+    // @Description: Duration of inactivity after which SLCAN is switched back to original protocol in seconds.
     // @Range: 0 32767
     // @User: Standard
     AP_GROUPINFO("TIMOUT", 3, AP_BoardConfig_CAN::SLCAN_Interface, _timeout, 0),