docs(angular.equals): add example

This Pull requests improves the doc by adding a example to `angular.equals` function.

Closes #14232

Author: SHAHRUKH-KHAN

src/Angular.js

@@ -979,6 +979,41 @@ function shallowCopy(src, dst) {
  * @param {*} o1 Object or value to compare.
  * @param {*} o2 Object or value to compare.
  * @returns {boolean} True if arguments are equal.
+ *
+ * @example
+   <example module="equalsExample" name="equalsExample">
+     <file name="index.html">
+      <div ng-controller="ExampleController">
+        <form novalidate>
+          <h3>User 1</h3>
+          Name: <input type="text" ng-model="user1.name">
+          Age: <input type="number" ng-model="user1.age">
+
+          <h3>User 2</h3>
+          Name: <input type="text" ng-model="user2.name">
+          Age: <input type="number" ng-model="user2.age">
+
+          <div>
+            <br/>
+            <input type="button" value="Compare" ng-click="compare()">
+          </div>
+          User 1: <pre>{{user1 | json}}</pre>
+          User 2: <pre>{{user2 | json}}</pre>
+          Equal: <pre>{{result}}</pre>
+        </form>
+      </div>
+    </file>
+    <file name="script.js">
+        angular.module('equalsExample', []).controller('ExampleController', ['$scope', function($scope) {
+          $scope.user1 = {};
+          $scope.user2 = {};
+          $scope.result;
+          $scope.compare = function() {
+            $scope.result = angular.equals($scope.user1, $scope.user2);
+          };
+        }]);
+    </file>
+  </example>
  */
 function equals(o1, o2) {
   if (o1 === o2) return true;