[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.
I never like using "code names" much in docs. I think just using human language makes things easier to read. If "[...] by passing it as second parameter of any normalizer, including [...]" is correct, I'm in favor of using that.