Rework documentation example for Jackson 3

[jobayle]

This use case:
https://docs.hibernate.org/stable/validator/reference/en-US/html_single/#section-property-node-name-provider

Uses the interpolator, which is an internal component of Jackson that was exposed for testing purposes.

In Jackson 3, the interpolator is no longer publicly exposed, a Visitor must be used instead.

See discussion here:
FasterXML/jackson#330

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[marko-bekhta]

Hi @jobayle 👋🏻

thanks for the PR! It's been a while since that example was introduced 🙂, I'll have a closer look.
Do you happen to know if the same visitor approach would work in 2.8 ? I'm thinking since Validator is not really tied to Jackson versions, it might as well be that people are using it with 2.x versions of Jackson so would be nice if we can keep the example working with different versions.