minor #16372 [Serializer] Remove redundant normalizers document (HypeMC)

This PR was merged into the 4.4 branch.

Discussion
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[Serializer] Remove redundant normalizers document

The `serializer/normalizers.rst` document doesn't really contain any data that isn't already present in `components/serializer.rst` so I'd suggest removing it.

There was only one reference to it in `serializer.rst` but that document already contains a link to the Normalizers section in `components/serializer.rst`.

Commits
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8a44f4a Remove redundant normalizers document

Author: javiereguiluz

components/serializer.rst

@@ -693,13 +693,13 @@ When serializing, you can set a callback to format a specific object property::
 Normalizers
 -----------
 
-Normalizers turn **object** into **array** and vice versa. They implement
-:class:`Symfony\\Component\\Serializer\\Normalizer\\NormalizableInterface`
-for normalize (object to array) and
-:class:`Symfony\\Component\\Serializer\\Normalizer\\DenormalizableInterface` for denormalize
-(array to object).
+Normalizers turn **objects** into **arrays** and vice versa. They implement
+:class:`Symfony\\Component\\Serializer\\Normalizer\\NormalizerInterface` for
+normalizing (object to array) and
+:class:`Symfony\\Component\\Serializer\\Normalizer\\DenormalizerInterface` for
+denormalizing (array to object).
 
-You can add new normalizers to a Serializer instance by using its first constructor argument::
+Normalizers are enabled in the serializer passing them as its first argument::
 
     use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
     use Symfony\Component\Serializer\Serializer;

serializer.rst

@@ -269,7 +269,6 @@ take a look at how this bundle works.
 .. toctree::
     :maxdepth: 1
 
-    serializer/normalizers
     serializer/custom_encoders
     serializer/custom_normalizer