fix code example

Author: devalog

fern/products/sdks/overview/python/configuration.mdx

@@ -13,11 +13,8 @@ groups:
       - name: fernapi/fern-python
         version: 0.7.1
         config:
-          client: null
-          filename: my_custom_client.py
-          class_name: MyClient
-          exported_filename: my_client.py
-          exported_class_name: APIClient
+          client:
+            class_name: `YourClient` 
 ```
 
 ## SDK Configuration Options