Update tutorial-kafka.md (#13056)
Update tutorial-kafka.md (#13056)

* Update tutorial-kafka.md

Added missing command to the doc for zookeeper before starting kafka

* Update docs/tutorials/tutorial-kafka.md

Co-authored-by: Frank Chen <b46d88371877ddcd44c759f0265b76c94e3085ba@apache.org>
monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid