message: doc: add doc to entity props
diff: @@ -134,7 +134,9 @@ export interface EntityProps
  EntityCesiumEvents,
  EventProps<Cesium.Entity> {
  children?: React.ReactNode;
  + // If true, the entity will be selected. It works only inside Viewer not CesiumWidget.
  selected?: boolean;
  + // If true, the entity will be tracked by the camera. It works only inside Viewer not CesiumWidget.
  tracked?: boolean;
  }
  