MONGOID-5268 remove the removal of JRuby support from documentation (#5259)
MONGOID-5268 remove the removal of JRuby support from documentation (#5259)

Co-authored-by: Oleg Pudeyev <e6fb06210fafc02fd7479ddbed2d042cc3a5155e@olegp.name>
mongodb/mongoid,mongodb/mongoid,mongodb/mongoid