Fix potential conflict with compose alias in racket/base

[NoahStoryM]

Summary of Changes

This PR modifies relation-doc to avoid potential conflicts caused by the planned addition of ∘ as an alias for compose in racket/base: racket/racket#5115 .

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[countvajhula]

The build failure is unrelated to your changes and looks like it has something to do with this upstream change in the algebraic package - maybe just relying on something only present in a recent version of Racket. I can investigate that later but probably not anything to worry about. Thank you for the proactive fix!