Update metricflow-time-spine.md (#6539)

Updated the WHERE clause for the BigQuery Daily code block. It throws an
error when using the original suggestion.

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https://docs-getdbt-com-git-aerielsoriano-patch-1-dbt-labs.vercel.app/docs/build/metricflow-time-spine

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website/docs/docs/build/metricflow-time-spine.md

@@ -179,8 +179,8 @@ final as (
 select *
 from final
 -- filter the time spine to a specific range
-where date_day > dateadd(year, -4, current_timestamp()) 
-and date_day < dateadd(day, 30, current_timestamp())
+where date_day > date_add(DATE(current_timestamp()), INTERVAL -4 YEAR)
+and date_day < date_add(DATE(current_timestamp()), INTERVAL 30 DAY)
 ```
 
 </File>