`View_spec` is almost identical to `Help_text.View_spec`, but additionally allows the user to customize how to display group names.

`type t````=` `{`

`core_spec : Help_text.View_spec.t;`
`group_name : Group_name.t ‑> Incr_dom_widgets__.Import.Vdom.Node.t;`

`}```
`val plain : t`
`val with_classes : group_name_class:string ‑> key_class:string ‑> plain_text_class:string ‑> t`

`with_classes` behaves the same as `Help_text.View_spec.with_classes` as far as the `core_spec`, and additionally converts group names to text nodes and wraps them in divs with the given group name class.