Update src/content/docs/r2-sql/reference/sql-reference.mdx

Co-authored-by: Nikita Lapkov <[email protected]>

Author: Marcinthecloud

src/content/docs/r2-sql/reference/sql-reference.mdx

@@ -131,7 +131,7 @@ ORDER BY partition_key [DESC]
 
 - **ASC**: Ascending order
 - **DESC**: Descending order
-- **Default**: partition_key DESC
+- **Default**: DESC on all columns of the partition key
 - Can contain any columns from the partition key
 
 ### Examples