Issue about Page 8.x/developer/extensions/frontend/examples/add-sidebar-widget.adoc

[zgj12306]

import {NgModule} from '@angular/core';
import {CommonModule} from '@angular/common';
import {SidebarWidgetRegistry} from 'core';
import {HttpClientModule} from '@angular/common/http';
import {HelloWorldSidebarWidgetModule} from './sidebar-widget/hello-world/hello-world-sidebar-widget.module';
import {HelloWorldSidebarWidgetComponent} from './sidebar-widget/hello-world/hello-world-sidebar-widget.component';
why not have containers /extensions//app/src/containers/sidebar-widget/hello-world