Update Chapter2.markdown

<table ng-controller="RestaurantTableController">
        <tr ng-repeat="restaurant in directory" ng-click="selectRestaurant($index)" ng-class="{selected: $index==selectedRow}">
            <td>{{restaurant.name}}</td>
            <td>{{restaurant.cuisine}}</td>
        </tr>
    </table>

的ng-class的后面少了个}