Fix TOC ordering

Author: dunglas

index.md

@@ -95,14 +95,14 @@
         2.  [Registering the Service](core/operation-path-naming.md#registering-the-service)
         3.  [Configure it](core/operation-path-naming.md#configure-it)
 19. [Accept `application/x-www-form-urlencoded` Form Data](core/form-data.md)
-12. [Using External Vocabularies](core/external-vocabularies.md)
-13. [Extending the JSON-LD context](core/extending-jsonld-context.md)
-20. [FOSUserBundle Integration](core/fosuser-bundle.md)
+20. [Using External Vocabularies](core/external-vocabularies.md)
+21. [Extending the JSON-LD context](core/extending-jsonld-context.md)
+22. [FOSUserBundle Integration](core/fosuser-bundle.md)
     1.  [Installing the Bundle](core/fosuser-bundle.md#installing-the-bundle)
     2.  [Enabling the Bridge](core/fosuser-bundle.md#enabling-the-bridge)
     3.  [Creating a `User` Entity with Serialization Groups](core/fosuser-bundle.md#creating-a-user-entity-with-serialization-groups)
-22. [NelmioApiDocBundle integration](core/nelmio-api-doc.md)
-23. [AngularJS Integration](core/angularjs-integration.md)
+23. [NelmioApiDocBundle integration](core/nelmio-api-doc.md)
+24. [AngularJS Integration](core/angularjs-integration.md)
     1.  [Restangular](core/angularjs-integration.md#restangular)
     2.  [ng-admin](core/angularjs-integration.md#ng-admin)