[Serializer] Name Converter

| Q                | A
| --------------- | ---
| Doc fix?      | no
| New docs? | yes symfony/symfony#13120
| Applies to   | 2.7

This is the documentation for the Serializer Name Converter feature.
Are you sure about that? https://en.wikipedia.org/wiki/CamelCase (see the Pascal/Microsoft part).

In fact, the class currently converts "this_is_a_test" to "thisIsATest" (lower camel case) if you pass the first parameter of its contructor at `true` and `ThisIsATest` if you pass it as `false`.
This is not really import because the normalizer will convert between CamelCase and lowerCamelCase when need.