rename some tags in flutter examples code

Author: vladiH

android/src/main/java/com/vladih/computer_vision/flutter_vision/FlutterVisionPlugin.java

@@ -242,21 +242,6 @@ public DetectionTask(Yolo yolo, Map<String, Object> args, String typing, Result
             this.class_threshold = (float) (double) (args.get("class_threshold"));
             this.result = result;
         }
-
-//    private DetectionTasks() {
-//      // Private constructor to prevent instantiation by other classes
-//    }
-
-        //    public static DetectionTasks getInstance(Yolo yolo, Map<String, Object> args, String typing, Result result) {
-//      if (instance == null) {
-//        synchronized (DetectionTasks.class) {
-//          if (instance == null) {
-//            instance = new DetectionTasks(yolo, args, typing, result);
-//          }
-//        }
-//      }
-//      return instance;
-//    }
         @Override
         public void run() {
             try {

example/lib/main.dart

@@ -527,7 +527,7 @@ class _YoloImageV8State extends State<YoloImageV8> {
             children: [
               TextButton(
                 onPressed: pickImage,
-                child: const Text("Pick image"),
+                child: const Text("Pick an image"),
               ),
               ElevatedButton(
                 onPressed: yoloOnImage,
@@ -673,7 +673,7 @@ class _TesseractImageState extends State<TesseractImage> {
               children: [
                 TextButton(
                   onPressed: pickImage,
-                  child: const Text("Pick image"),
+                  child: const Text("Pick an image"),
                 ),
                 ElevatedButton(
                   onPressed: tesseractOnImage,