manual class sections lack a <h3> title

Class sections lack a <h3> title

neither
@include-section["color-class.scrbl"] in https://github.com/racket/draw/blob/master/draw-doc/scribblings/draw/draw.scrbl
or @defclass/title[color% object% ()]{ in https://github.com/racket/draw/blob/master/draw-doc/scribblings/draw/color-class.scrbl
does not cause a title for the section to be generated

but the first section 1. Overview does have a title

https://github.com/racket/draw/blob/master/draw-doc/scribblings/draw/guide.scrbl
@title[#:tag "overview"]{Overview}

As I wrote this issue I found

This form is normally used to create a section to be rendered on its own HTML. The 'hidden style is used because the definition box serves as a title.

https://docs.racket-lang.org/scribble/doc-classes.html#%28form._%28%28lib._scribble%2Fmanual..rkt%29._defclass%2Ftitle%29%29

So maybe this is intentional?

I'd prefer a <h3> heading "6 class%" followed by the definition box but I'm guessing that adding @title[#:tag "color%"]{color%} is the wrong way to achieve this. (I'm assuming it is desirable)

The other option would be to change
(list* (title #:style 'hidden (to-element (decl-name decl)))
to
(list* (title #:style #f (to-element (decl-name decl)))
but that would also affect defmixin/title and definterface/title.

PS I noticed this because I went looking to click the title to find the manual source like I could do for section 1:

• there is a 6.1 Equality heading

• there is no 6 colour% heading

Start with draw-doc/scribblings/draw/draw.scrbl, color-class.scrbl, and guide.scrbl to compare the generated class and section headings. Then inspect scribble/private/manual-class.rkt around the title construction and the Scribble manual documentation for defclass/title. Done means the intended class heading behavior is decided, implemented without unintentionally changing related forms, and reflected in the generated documentation.