Add a comment of how to clear the display to integration example

examples/integration/src/main.rs

@@ -163,6 +163,29 @@ pub fn main() {
                     program.background_color(),
                 );
 
+                // If you are using this example and you have no `scene` on your application,
+                // you can clear screen by this code.
+                /*
+                let _ =
+                    encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                        color_attachments: &[
+                            wgpu::RenderPassColorAttachmentDescriptor {
+                                attachment: &frame.view,
+                                resolve_target: None,
+                                load_op: wgpu::LoadOp::Clear,
+                                store_op: wgpu::StoreOp::Store,
+                                clear_color: wgpu::Color {
+                                    r: 1.0,
+                                    g: 1.0,
+                                    b: 1.0,
+                                    a: 1.0,
+                                },
+                            },
+                        ],
+                        depth_stencil_attachment: None,
+                    });
+                */
+
                 // And then iced on top
                 let mouse_interaction = renderer.backend_mut().draw(
                     &mut device,