Simplify method description

Author: mataku

packages/webview_flutter/webview_flutter_android/example/lib/main.dart

@@ -804,7 +804,7 @@ class SampleMenu extends StatelessWidget {
 
     if (context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(
-        content: Text('Payment Request API enabled: $paymentRequestEnabled'),
+        content: Text('Payment Request API supported: $paymentRequestEnabled'),
       ));
     }
   }

packages/webview_flutter/webview_flutter_android/lib/src/android_webview_controller.dart

@@ -940,7 +940,7 @@ enum MixedContentMode {
 
 /// See https://developer.android.com/reference/androidx/webkit/WebViewFeature#constants_1.
 enum WebViewFeatureType {
-  /// Feature for isFeatureSupported. This feature covers setPaymentRequestEnabled, getPaymentRequestEnabled, setHasEnrolledInstrumentEnabled, and getHasEnrolledInstrumentEnabled,
+  /// Feature for isFeatureSupported. This feature covers [WebSettingsCompat.setPaymentRequestEnabled].
   paymentRequest,
 }