[racket] scribble formatting tweak?

With Scribble-formatted API documentation, one thing I kinda miss from 
Lisp-y manuals (such as those formatted by Texinfo, or CLtL2) is a 
better cue that something is documenting, say, a procedure, rather than 
syntax, rather than a parameter.

One way to do this with Scribble would be to subtly add a label to the 
light blue background for definition syntax synopses.  For example 
(click the second thumbnail): http://imgur.com/a/xFTFn

Of course, with this particular format, the definition could obscure 
this label, so unless you wanted to make the label a really big font 
that was intended to be obscured (which doesn't really fit the look of 
the manuals), it would complicate formatting.

Or you could put the label in the right margin, where footnotes go, but 
I'd actually like to get rid of the right margin as a necessary thing 
later, and turning footnotes into hover slide-outs when there isn't 
enough horizontal room, so I'm not fond of putting anything new in the 
margins that we'd want visible as cues.

Comments?

Neil V.