fix(chapter-1): correct typo based on a customer review

Author: pkozlowski-opensource

1820EN_01_Code/04 - hierarchy of scopes/index.html

@@ -5,7 +5,7 @@
     <script type="text/javascript">
 
         var WorldCtrl = function ($scope) {
-            $scope.population = 7000000;
+            $scope.population = 7000;
             $scope.countries = [
                 {name:'France', population:63.1},
                 {name:'United Kingdom', population:61.8}