Refactor databricks-configs to correct docs bug on columns (#7952)

Author: amychen1776

website/docs/reference/resource-configs/databricks-configs.md

@@ -161,16 +161,14 @@ models:
   - name: customers
     columns:
       - name: customer_id
-        config:
-          databricks_tags:
-            data_classification: "public"
+        databricks_tags:
+          data_classification: "public"
       - name: email
-        config:
-          databricks_tags:
-            data_classification: "pii"
-          column_mask:
-            function: my_catalog.my_schema.mask_email
-            using_columns: "customer_id, 'literal string'"
+        databricks_tags:
+          data_classification: "pii"
+        column_mask:
+          function: my_catalog.my_schema.mask_email
+          using_columns: "customer_id, 'literal string'"
 ```
 
 </File>