Racket: Documented signatures for `bound-id-set-map` and `bound-id-set-for-each` incorrect

[rocketnia]

The documented signatures for bound-id-set-map and bound-id-set-for-each seem wrong:

@defproc[(bound-id-set-map [s bound-id-set?]) list?]
@defproc[(bound-id-set-for-each [s bound-id-set?]) void?]

The documentation suggests they're comparable to free-id-set-map and free-id-set-for-each, which each take a function to call on each element, but that argument is missing here.

Calling procedure-arity confirms that these procedures have arities of 2, so I think this is simply a documentation issue.

[gus-massa]

I think it's an error in the docs, the unary version makes no sense.

Do you want to send a PR? If not, we can fix it instead.

[rocketnia]

Thanks for suggesting to make a PR. This is my first PR for Racket, and it was a good excuse to speed with the build instructions and contributing guidelines. :)

[gus-massa]

Merged in https://github.com/racket/racket/commit/73dd32cd51a3b008a5ed0b471f859830287a4a2f . Thanks!