bpo-29557: Remove ambiguous line in binhex docs (GH-90) (GH-475)

"appears to not work in all cases" does not inspire confidence in this
module. I can find no context for what bug this was referencing so it
should be removed.
(cherry picked from commit 6de2b7817fa9403e81dc38f13f3690f0bbf3d064)
1 file changed