docs(guide/concepts): move ng-app into example text

Closes #6639

Author: petebacondarwin

docs/content/guide/concepts.ngdoc

@@ -32,9 +32,9 @@ In the following example we will build a form to calculate the costs of an invoi
 Let's start with input fields for quantity and cost whose values are multiplied to produce the total of the invoice:
 
 
-<example>
+<example name="guide-concepts-1" ng-app-included="true">
   <file name="index.html">
-      <div ng-init="qty=1;cost=2">
+      <div ng-app ng-init="qty=1;cost=2">
         <b>Invoice:</b>
         <div>
           Quantity: <input type="number" ng-model="qty" required >
@@ -102,7 +102,7 @@ The concept behind this is <a name="databinding">"{@link databinding two-way dat
 Let's add some more logic to the example that allows us to enter and calculate the costs in
 different currencies and also pay the invoice.
 
-<example module="invoice1">
+<example name="guide-concepts-2" ng-app-included="true" >
   <file name="invoice1.js">
     angular.module('invoice1', [])
       .controller('InvoiceController', function() {
@@ -128,7 +128,7 @@ different currencies and also pay the invoice.
       });
   </file>
   <file name="index.html">
-      <div ng-controller="InvoiceController as invoice">
+      <div ng-app="invoice1" ng-controller="InvoiceController as invoice">
         <b>Invoice:</b>
         <div>
           Quantity: <input type="number" ng-model="invoice.qty" required >
@@ -191,7 +191,7 @@ from the web, e.g. by calling the Yahoo Finance API, without changing the contro
 
 Let's refactor our example and move the currency conversion into a service in another file:
 
-<example module="invoice2">
+<example name="guide-concepts-2" ng-app-included="true">
   <file name="finance2.js">
     angular.module('finance2', [])
       .factory('currencyConverter', function() {
@@ -228,7 +228,7 @@ Let's refactor our example and move the currency conversion into a service in an
       }]);
   </file>
   <file name="index.html">
-      <div ng-controller="InvoiceController as invoice">
+      <div ng-app="invoice2" ng-controller="InvoiceController as invoice">
         <b>Invoice:</b>
         <div>
           Quantity: <input type="number" ng-model="invoice.qty" required >
@@ -302,7 +302,7 @@ to something shorter like `a`.
 Let's finish our example by fetching the exchange rates from the Yahoo Finance API.
 The following example shows how this is done with Angular:
 
-<example module="invoice3">
+<example name="guide-concepts-3" ng-app-included="true">
   <file name="invoice3.js">
     angular.module('invoice3', ['finance3'])
       .controller('InvoiceController', ['currencyConverter', function(currencyConverter) {
@@ -356,7 +356,7 @@ The following example shows how this is done with Angular:
       }]);
   </file>
   <file name="index.html">
-      <div ng-controller="InvoiceController as invoice">
+      <div ng-app="invoice3" ng-controller="InvoiceController as invoice">
         <b>Invoice:</b>
         <div>
           Quantity: <input type="number" ng-model="invoice.qty" required >