[3.13] gh-118342: [Enum] update docs (GH-137290) (GH-142954)

gh-118342: [Enum] update docs (GH-137290)

(cherry picked from commit e79c39101a9f55882f54df0bb3ecfa23238692de)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>