RUBY-2352 Add try_next example to resuming change stream user guide (#2079)
RUBY-2352 Add try_next example to resuming change stream user guide (#2079)

Co-authored-by: Oleg Pudeyev <20b70f0af00562e63758b9ee42012ecc96c58590@bsdpower.com>
mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver