Update dbt-databricks specific configs doc on dbt page

[rodrigorabioglio]

Not sure where is the best way to post this, but I would like to point out that the support of incremental_predicates config is not documented here, on the merge strategy.

I could only find that this was supported by inspecting the macros. Also, it expects a list (when using the merge strategy) and not a string, as it is documented under replace_where strategy.