docs: Add strict_order_by in doc (#3044)

Author: CNLHC

docs/reference/config.md

@@ -54,6 +54,8 @@ Each mapping in the `sql` collection has the following keys:
   - A mapping to configure query analysis. See [analyzer](#analyzer) for the supported keys.
 - `strict_function_checks`
   - If true, return an error if a called SQL function does not exist. Defaults to `false`.
+- `strict_order_by`
+  - If true, return an error if a order by column is ambiguous. Defaults to `true`.
 
 ### codegen