Unclear documentation on Custom Resource Type

**Your Godot version:** 4.2

**Issue description:** On the custom resource sections, custom editors and data visualization is mentioned. But I don't think they current documentation covers how to make editors for custom types. As someone that thinks they might want an editable data table, additional documentation will help.

**URL to the documentation page (if already existing):** https://docs.godotengine.org/en/stable/tutorials/scripting/resources.html