Fix double header

Author: Blargian

docs/integrations/data-sources/iceberg.md

@@ -8,8 +8,6 @@ doc_type: 'guide'
 
 import IcebergFunction from '@site/docs/sql-reference/table-functions/iceberg.md';
 
-# Iceberg integration
-
-Users can integrate with the Iceberg table format via the table function. 
+> Users can integrate with the Iceberg table format via the table function.
 
 <IcebergFunction/>