adapted tutorial message to show correct dimension name

dbt-metricflow/dbt_metricflow/cli/main.py

@@ -129,7 +129,7 @@ def tutorial(ctx: click.core.Context, cfg: CLIContext, msg: bool, clean: bool) -
  `mf query --metrics transactions --group-by metric_time,customer__customer_country --order metric_time`
  11. Add a coarser time granularity:
  `mf query --metrics transactions --group-by metric_time__week --order metric_time__week`
- 12. Try a more complicated query: mf query --metrics transactions,transaction_usd_na --group-by metric_time,is_large --order metric_time --start-time 2022-03-20 --end-time 2022-04-01.
+ 12. Try a more complicated query: mf query --metrics transactions,transaction_usd_na --group-by metric_time,transaction__is_large --order metric_time --start-time 2022-03-20 --end-time 2022-04-01.
  13. When you're done with the tutorial, run mf tutorial --clean to delete sample models and seeds.
  """
  )