[racket] match in Advanced Student?

My experience last year was that the restrictions on some of these
sub-forms were arbitrary and not helpful. It also makes it harder for
students because if they click on the "wrong" documentation, they
don't understand why the thing that the docs say should work doesn't.

> Teaching languages aren't Racket. And we should have students sign a language not to put Racket on their resume when they apply for jobs after taking one of our courses.

There should be a pop-up if you select a teaching language whereby you
swear to not put "Racket" on your resume.  We can then record their
identity and Eli can write a script that searches the Web every month
for non-compliance.

Shriram