message: docs: use const in dynamic-component-loader example
  Use const instead of let. Some of the variables are never reassigned, so it is preferred to use const over let
  PR Close
diff: @@ -36,14 +36,14 @@ export class AdBannerComponent implements OnInit, OnDestroy {
  loadComponent() {
  this.currentAdIndex = (this.currentAdIndex + 1) % this.ads.length;
  - let adItem = this.ads[this.currentAdIndex];
  + const adItem = this.ads[this.currentAdIndex];
  - let componentFactory = this.componentFactoryResolver.resolveComponentFactory(adItem.component);
  + const componentFactory = this.componentFactoryResolver.resolveComponentFactory(adItem.component);
  - let viewContainerRef = this.adHost.viewContainerRef;
  + const viewContainerRef = this.adHost.viewContainerRef;
  viewContainerRef.clear();
  - let componentRef = viewContainerRef.createComponent(componentFactory);
  + const componentRef = viewContainerRef.createComponent(componentFactory);
  (<AdComponent>componentRef.instance).data = adItem.data;
  }
  