feature symfony#5483 [FrameworkBundle] Name converter of Serializer (dunglas)

This PR was squashed before being merged into the 2.8 branch (closes symfony#5483).

Discussion
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[FrameworkBundle] Name converter of Serializer

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes symfony/symfony#14987
| Applies to    | 2.8
| Fixed tickets | n/a

Commits
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7a4d9fc [FrameworkBundle] Name converter of Serializer

Author: wouterj

Diff for: components/serializer.rst

@@ -344,6 +344,8 @@ method on the normalizer definition::
     $serializer = new Serializer(array($normalizer), array($encoder));
     $serializer->serialize($person, 'json'); // Output: {"name":"foo","sportsman":false}
 
+.. _component-serializer-converting-property-names-when-serializing-and-deserializing:
+
 Converting Property Names when Serializing and Deserializing
 ------------------------------------------------------------
 

Diff for: reference/configuration/framework.rst

@@ -104,6 +104,7 @@ Configuration
     * :ref:`enabled <reference-serializer-enabled>`
     * :ref:`cache <reference-serializer-cache>`
     * :ref:`enable_annotations <reference-serializer-enable_annotations>`
+    * `name_converter`_
 
 secret
 ~~~~~~
@@ -1505,6 +1506,24 @@ If this option is enabled, serialization groups can be defined using annotations
 
     For more information, see :ref:`cookbook-serializer-using-serialization-groups-annotations`.
 
+name_converter
+..............
+
+.. versionadded:: 2.8
+    The ``name_converter`` setting was introduced in Symfony 2.8.
+
+**type**: ``string``
+
+The name converter to use.
+The :class:`Symfony\\Component\\Serializer\\NameConverter\\CamelCaseToSnakeCaseNameConverter`
+name converter can enabled by using the ``serializer.name_converter.camel_case_to_snake_case``
+value.
+
+.. seealso::
+
+    For more information, see
+    :ref:`component-serializer-converting-property-names-when-serializing-and-deserializing`.
+
 Full Default Configuration
 --------------------------