[Reference][Form Types] Add missing (but existing) options to "form" type

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | #3410

* The removed link to `/cookbook/form/inherit_data_option` for the `inherit_data` option is contained in the existing and now referenced `options/inherit_data.rst.inc`.
* Fixed some formatting issues.
* I've tweaked the `empty_data` description to be a bit more generic as it was focused on the `choice` field only.