message: doc: ImageryLayer order
diff: @@ -6,6 +6,26 @@ import createCesiumComponent from "./core/CesiumComponent";
  @summary
  `ImageryLayer` is a imargery layer on the globe.
  +Layers are added in order of JSX from the top.
  +
  +```jsx
  +// Back layer
  +<ImageryLayer imageryProvider={provider1} />
  +<ImageryLayer imageryProvider={provider2} />
  +<ImageryLayer imageryProvider={provider3} />
  +// Front layer
  +```
  +
  +is equivalent to:
  +
  +```js
  +viewer.imageryLayers.add(provider1);
  +viewer.imageryLayers.add(provider2);
  +viewer.imageryLayers.add(provider3);
  +```
  +
  +As a result, the layer added at the very end is the frontmost when actually displayed.
  +
  Note: `imageryProvider` property is read only. See also [guide](/guide#cesium-read-only-properties).
  */
  @@ -155,6 +175,7 @@ const ImageryLayer = createCesiumComponent<
  mount(element, context) {
  if (context.imageryLayerCollection) {
  context.imageryLayerCollection.add(element);
  + console.log("added", element);
  }
  },
  unmount(element, context) {
  