Fix playbook name

playbooks/edx-east/create_db_and_users.yml

@@ -2,7 +2,7 @@
 # This play will create databases and user for an application.
 # It can be run like so:
 #
-# ansible-playbook -c local -i 'localhost,' create_analytics_reports_dbs.yml -e@./db.yml
+# ansible-playbook -c local -i 'localhost,' create_dbs_and_users.yml -e@./db.yml
 #
 # where the content of dbs.yml contains the following dictionaries
 #