explicitly state that analyze image is not supported on the web

@@ -85,7 +85,7 @@ abstract class MobileScannerPlatform extends PlatformInterface {
   ///
   /// Upon calling this method, the necessary camera permission will be requested.
   ///
-  /// The given [cameraDirection] is used as the direction for the camera that needs to be set up.
+  /// The given [StartOptions.cameraDirection] is used as the direction for the camera that needs to be set up.
   Future<MobileScannerViewAttributes> start(StartOptions startOptions) {
     throw UnimplementedError('start() has not been implemented.');
   }

@@ -184,6 +184,11 @@ class MobileScannerWeb extends MobileScannerPlatform {
   }
 
   @override
+  Future<BarcodeCapture?> analyzeImage(String path) {
+    throw UnsupportedError('analyzeImage() is not supported on the web.');
+  }
+
+  @override
   Widget buildCameraView() {
     if (!_barcodeReader.isScanning) {
       return const SizedBox();