update docs

docs/step2-09/demo/src/index.tsx

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import { reducer } from './reducers';
+import { applyMiddleware, createStore, compose } from 'redux';
+import thunk from 'redux-thunk';
+import { Provider } from 'react-redux';
+import { TodoApp } from './components/TodoApp';
+import { initializeIcons } from '@uifabric/icons';
+import { Store, FilterTypes } from './store';
+import * as service from './service';
+
+/* Goop for making the Redux dev tool to work */
+declare var window: any;
+const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
+function createStoreWithDevTool(reducer, initialStore?: Store) {
+  return createStore(reducer, initialStore, composeEnhancers(applyMiddleware(thunk)));
+}
+
+(async () => {
+  const preloadStore = {
+    todos: await service.getAll(),
+    filter: 'all' as FilterTypes
+  };
+
+  const store = createStoreWithDevTool(reducer, preloadStore);
+
+  initializeIcons();
+
+  ReactDOM.render(
+    <Provider store={store}>
+      <TodoApp />
+    </Provider>,
+    document.getElementById('app')
+  );
+})();