MONGOID-5456 Add documentation for responding to to_* (#5434)
MONGOID-5456 Add documentation for responding to to_* (#5434)

* MONGOID-5456 Add documentation for responding to to_*

* Apply suggestions from code review

Co-authored-by: Oleg Pudeyev <aa872f0244415da0fe7cddda062128938b373c32@users.noreply.github.com>

Co-authored-by: Oleg Pudeyev <aa872f0244415da0fe7cddda062128938b373c32@users.noreply.github.com>
mongodb/mongoid,mongodb/mongoid,mongodb/mongoid