Help_text.View_specA View_spec.t allows the user to customize how the help text is converted to a Vdom node.
val plain : tplain converts all help text parts to text nodes without further modification.
val with_classes : key_class:string -> plain_text_class:string -> twith_classes converts all help text parts to text nodes and wraps them in spans with the given classes. This allows the user to style the help text using CSS.