fix: use explicit /index path for data tables reference links

Author: lordhumunguz

onboarding/analytics-tools/bigquery-essentials.mdx

@@ -157,7 +157,7 @@ order by 1 desc, 2
 | `obt_customers` | One row per customer | `sm_customer_key`, `customer_email`, `source_system` |
 | `rpt_ad_performance_daily` | Daily ad metrics by ad | `date`, `sm_channel`, `ad_spend`, `ad_impressions` |
 
-For complete table documentation, see the [Data Tables Reference](/data-activation/data-tables/sm_transformed_v2).
+For complete table documentation, see the [Data Tables Reference](/data-activation/data-tables/sm_transformed_v2/index).
 
 ---
 
@@ -260,7 +260,7 @@ For more details on managing compute resources, see the [Workload Management Doc
 
 ## Getting Help
 
-- **Query errors**: Check column names against the [table documentation](/data-activation/data-tables/sm_transformed_v2)
+- **Query errors**: Check column names against the [table documentation](/data-activation/data-tables/sm_transformed_v2/index)
 - **Permission issues**: See [Google Groups Access Control](/onboarding/analytics-tools/google-groups-access-control)
 - **Data questions**: Contact your SourceMedium support team
 
@@ -277,6 +277,6 @@ For more details on managing compute resources, see the [Workload Management Doc
 - [BigQuery Pricing](https://cloud.google.com/bigquery/pricing)
 
 **SourceMedium Resources:**
-- [Data Tables Reference](/data-activation/data-tables/sm_transformed_v2)
+- [Data Tables Reference](/data-activation/data-tables/sm_transformed_v2/index)
 - [Looker Studio Guide](/onboarding/analytics-tools/looker-studio-guide)
 - [Google Groups Access Control](/onboarding/analytics-tools/google-groups-access-control)

onboarding/analytics-tools/looker-studio-guide.mdx

@@ -434,4 +434,4 @@ For teams with 5+ users, manage access via [Google Groups](/onboarding/analytics
 **SourceMedium Resources:**
 - [Google Groups Access Control](/onboarding/analytics-tools/google-groups-access-control)
 - [BigQuery Essentials](/onboarding/analytics-tools/bigquery-essentials)
-- [Data Tables Reference](/data-activation/data-tables/sm_transformed_v2)
+- [Data Tables Reference](/data-activation/data-tables/sm_transformed_v2/index)