Restore some internal references

Author: javiereguiluz

best_practices.rst

@@ -223,6 +223,7 @@ controllers shouldn't contain any business logic. Controllers should contain
 nothing more than a few lines of *glue-code*, so you are not coupling the
 important parts of your application.
 
+.. _best-practice-controller-annotations:
 .. _best-practice-controller-attributes:
 
 Use Attributes to Configure Routing, Caching, and Security

components/serializer.rst

@@ -288,6 +288,7 @@ for each format:
 
     $classMetadataFactory = new ClassMetadataFactory(new XmlFileLoader('/path/to/your/definition.xml'));
 
+.. _component-serializer-attributes-groups-annotations:
 .. _component-serializer-attributes-groups-attributes:
 
 Then, create your groups definition:

page_creation.rst

@@ -55,6 +55,7 @@ random) number and prints it. To do that, create a "Controller" class and a
         }
     }
 
+.. _annotation-routes:
 .. _attribute-routes:
 
 Now you need to associate this controller function with a public URL (e.g. ``/lucky/number``)

security.rst

@@ -2316,6 +2316,7 @@ will happen:
    be shown the 403 access denied page (which you can
    :ref:`customize <controller-error-pages-by-status-code>`).
 
+.. _security-securing-controller-annotations:
 .. _security-securing-controller-attributes:
 
 Another way to secure one or more controller actions is to use the ``#[IsGranted()]`` attribute.