Update documentation concerning id sort for Criteria#first and Criteria#last
Update documentation concerning id sort for Criteria#first and Criteria#last

kay-kim/mongoid,nviennot/mongoid,Welovroi/mongoid,mongodb/mongoid,nviennot/mongoid,mongodb/mongoid,herimedia/mongoid,mongodb/mongoid,herimedia/mongoid,jonhyman/mongoid,Welovroi/mongoid,Sharevari-Inc/mongoid,jonhyman/mongoid,kay-kim/mongoid,Sharevari-Inc/mongoid