Update ExampleTodoList.md

[newtonkiragu]

Declared var rootReducer then assigned it to function combineReducers

---

name: "\U0001F4DD Documentation Fix"
about: Fixing a problem in an existing Example: Todo List

Checklist

• Is there an existing issue for this PR?
  • link issue here
• Have the files been linted and formatted?

What docs page needs to be fixed?

• Section: Entry Point
• Page: Example: Todo List

What is the problem?

There is a rootReducer that is imported but never declared

// index.js
import React from 'react'
import { render } from 'react-dom'
import { Provider } from 'react-redux'
import { createStore } from 'redux'
import rootReducer from './reducers'
import App from './components/App'

const store = createStore(rootReducer)

render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById('root')
)

// reducers/index.js

import { combineReducers } from 'redux'
import todos from './todos'
import visibilityFilter from './visibilityFilter'

export default combineReducers({
  todos,
  visibilityFilter
})

What changes does this PR make to fix the problem?

It declares the rootReducer, then assigns it and finally exports it

// reducers/index.js

import { combineReducers } from 'redux'
import todos from './todos'
import visibilityFilter from './visibilityFilter'

let rootReducer = combineReducers({
  todos,
  visibilityFilter
});
export default rootReducer

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