Documentation - modify introspection results

I'm submitting a ...

* [ ] bug report
* [ ] feature request
* [x] question

PostGraphile version: 4.3.3

You mentioned the possibility of changing introspection results to switch data types. Please provide some examples on how to do this.

Additionally, it would be nice to know how to _add_ things to the introspection results (i.e. to implement additional smart comments).

Start by reviewing the existing PostGraphile documentation on introspection results, data type changes, and smart comments. Add examples showing how to change data types and how to add items to introspection results, then verify that both requested workflows are documented clearly.

Scritto dal modello di indicizzazione a partire dal testo della issue.