minor symfony#8866 Fixed the internal references of the serializer docs (javiereguiluz)

This PR was merged into the 3.3 branch.

Discussion
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Fixed the internal references of the serializer docs

This fixes symfony#7799.

I've picked the 3.3 branch because it's the first branch where the Encoders section exists (in 2.7 and 2-8 we only have normalizers).

Commits
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7bebc24 Fixed the internal references of the serializer docs

Author: weaverryan

components/serializer.rst

@@ -11,17 +11,14 @@ The Serializer Component
 In order to do so, the Serializer component follows the following
 simple schema.
 
-.. _component-serializer-encoders:
-.. _component-serializer-normalizers:
-
 .. image:: /_images/components/serializer/serializer_workflow.png
 
 As you can see in the picture above, an array is used as a man in
 the middle. This way, Encoders will only deal with turning specific
 **formats** into **arrays** and vice versa. The same way, Normalizers
 will deal with turning specific **objects** into **arrays** and vice versa.
 
-Serialization is a complex topic. This component may not cover all your use cases out of the box, 
+Serialization is a complex topic. This component may not cover all your use cases out of the box,
 but it can be useful for developing tools to serialize and deserialize your objects.
 
 Installation
@@ -543,6 +540,8 @@ When serializing, you can set a callback to format a specific object property::
     $serializer->serialize($person, 'json');
     // Output: {"name":"cordoval", "age": 34, "createdAt": "2014-03-22T09:43:12-0500"}
 
+.. _component-serializer-normalizers:
+
 Normalizers
 -----------
 
@@ -602,6 +601,8 @@ There are several types of normalizers available:
     This normalizer converts :phpclass:`SplFileInfo` objects into a data URI
     string (``data:...``) such that files can be embedded into serialized data.
 
+.. _component-serializer-encoders:
+
 Encoders
 --------