RUBY-1554 Mention to_json in logging examples in tutorial (#2589)
RUBY-1554 Mention to_json in logging examples in tutorial (#2589)

* RUBY-1554 Mention to_json in logging examples in tutorial

* Apply suggestions from code review

* RUBY-1554 update comment

* RUBY-1554 fix spacing
mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver