Docs: Feedback for Mapping to JDBC

Hi, I have some feedback about [this page](https://github.com/hazelcast/hz-docs/edit/main/docs/modules/sql/pages/mapping-to-jdbc.adoc)

I assume that the yaml config lines shown are set in the Hazelcast config, but this is not clear in the documentation. I suggest changing the text above this to say "modify the Hazelcast config blah blah blah", and move create mapping to just above the create mapping example.

I'd also add a "okay, this is obvious" note about the names having to be the same ("people" in the example).

And a question - since this is a configuration mod, how/when/will it be implemented in Viridian?