raco setup: fix problem with docs
raco setup: fix problem with docs

Support for "moving" pre-built docs into place did not handle
the case that the version number is wrong, which could happen
either because the pre-built version doesn't match or the docs
were built (in an old version) without a "synced.rktd" marker.

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket