AP_InetialSensor: fixup ENABLE_MASK parameter desc

libraries/AP_InertialSensor/AP_InertialSensor.cpp

@@ -441,9 +441,9 @@ const AP_Param::GroupInfo AP_InertialSensor::var_info[] = {
     // @Path: ../AP_InertialSensor/BatchSampler.cpp
     AP_SUBGROUPINFO(batchsampler, "LOG_",  39, AP_InertialSensor, AP_InertialSensor::BatchSampler),
 
-    // @Group: ENABLE_MASK
+    // @Param: ENABLE_MASK
     // @DisplayName: IMU enable mask
-    // @Description: This is a bitmask of IMUs to enable. It can be used to prevent startup of specific detected IMUs
+    // @Description: Bitmask of IMUs to enable. It can be used to prevent startup of specific detected IMUs
     // @User: Advanced
     // @Values: 1:FirstIMUOnly,3:FirstAndSecondIMU,7:FirstSecondAndThirdIMU,127:AllIMUs
     // @Bitmask: 0:FirstIMU,1:SecondIMU,2:ThirdIMU