fix: wrong style in code snippet

Author: Tom-Dynamsoft

programming/features/barcode-scan-region.md

@@ -33,11 +33,10 @@ settings.roi.points[2] = {x:90, y:90};
 settings.roi.points[3] = {x:10, y:90};
 // Update the settings to a specific template.
 await router.updateSettings("ReadSingleBarcode", settings);
-
+//============================================================
 // Alternatively, you can set the scan region directly at the image source in a simpler way.
 // If you’re using Dynamsoft Camera Enhancer, the following example demonstrates 
 // how to specify a single scan region without modifying the template.
-
 let cameraEnhancer = await Dynamsoft.DCE.CameraEnhancer.createInstance();
 cameraEnhancer.setScanRegion({
   x: 10,
@@ -46,7 +45,6 @@ cameraEnhancer.setScanRegion({
   height: 80,
   isMeasuredInPercentage: true,
 });
-
 ```
 >
 ```c++