Clarify two way dispatch binding in more detail (#1387)

* Clarify two way dispatch binding in more detail

* Formatted the new code blocks

docs/using-react-redux/connect-dispatching-actions-with-mapDispatchToProps.md

@@ -151,11 +151,25 @@ If your `mapDispatchToProps` function is declared as taking two parameters, it w
 
 This means, instead of re-binding new `props` to action dispatchers upon component re-rendering, you may do so when your component's `props` change.
 
+**Binds on component re-rendering**
+
+```js
+render() {
+  return <button onClick={() => this.props.toggleTodo(this.props.todoId)} />
+}
+
+const mapDispatchToProps = dispatch => {
+  toggleTodo: todoId => dispatch(toggleTodo(todoId))
+}
+```
+
+**Binds on `props` change**
+
 ```js
-// binds on component re-rendering
-;<button onClick={() => this.props.toggleTodo(this.props.todoId)} />
+render() {
+  return <button onClick={() => this.props.toggleTodo()} />
+}
 
-// binds on `props` change
 const mapDispatchToProps = (dispatch, ownProps) => {
   toggleTodo: () => dispatch(toggleTodo(ownProps.todoId))
 }