Update comments

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/DeviceManagementServiceImpl.java

@@ -491,7 +491,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
         DeviceManagementProviderService deviceManagementProviderService =
                 DeviceMgtAPIUtils.getDeviceManagementService();
         try {
-            long startTime = System.currentTimeMillis(); // Start measuring response time
+            long startTime = System.currentTimeMillis(); // Start measuring API call response time
             
             DeviceIdentifier deviceIdentifier = new DeviceIdentifier(deviceId, deviceType);
             Device persistedDevice = deviceManagementProviderService.getDevice(deviceIdentifier, true);
@@ -499,7 +499,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                 return Response.status(Response.Status.NOT_FOUND).build();
             }
             boolean response = deviceManagementProviderService.disenrollDevice(deviceIdentifier);
-            long endTime = System.currentTimeMillis(); // End measuring response time
+            long endTime = System.currentTimeMillis(); // End measuring API call response time
             long responseTime = endTime - startTime;
             
             // Save the response time, start time, and end time to Google Spreadsheet