Fix incorrect dim_customers reference in customer_details_dda

dim_customers has profile fields only, not lifetime metrics.
Removed misleading suggestion to use it for LTV calculations.

Author: lordhumunguz

onboarding/data-docs/tables/customer_details_dda.mdx

@@ -7,7 +7,7 @@ icon: 'user'
 The **Customer Details** table (`obt_customers`) provides customer-level data including contact information, subscription status, and first/last order references. Use this table for customer lookups and subscription analysis.
 
 <Note>
-**For lifetime metrics (LTV, order counts, acquisition channel):** Join to `obt_orders` and aggregate, or use `dim_customers` which includes pre-calculated lifetime fields.
+**For lifetime metrics (LTV, order counts, acquisition channel):** Join to `obt_orders` and aggregate. See the example query below.
 </Note>
 
 ## When to Use This Table