-0 on doing this.  While class markup has crept into the Built-in Functions section, super() isn't really used this way (people don't subclass it or run isinstance on it).

Elsewhere in the docs, all the links to this entry use the markup, :func:`super` which looks nicer in the docs than the class reference.

In terms of markup, "function" is a role rather than an actual type, it is used for most callables whether or not ``isinstance(obj, type(lambda: None))`` returns true.