[Serializer] Add context for CamelCaseToSnakeCaseNameConverter

[fabpot]

Q	A
Feature PR	symfony/symfony#53898
PR author(s)	@AurelienPillevesse
Merged in	7.1

We created this issue to not forget to document this new feature. We would really appreciate if you can help us with this task. If you are not sure how to do it, please ask us and we will help you.

To fix this issue, please create a PR against the 7.1 branch in the symfony-docs repository.

Thank you! 😃

[alexandre-daubois]

This should be put on hold, because the PR introduces a breaking change. The implementation is likely to change from what it is now.

[xabbuh]

The BC break was fixed in symfony/symfony#54531.