Added raise_on_unexpected_status to user guide

doc/user_guide/user-guide.md

@@ -1 +1,14 @@
 # SaaS API for Python User Guide
+
+## Raise Error on Response Status Code Other Than 200
+
+The default behavior of the API client is to return a response with a status code and optionally an attribute `parsed` containing the returned data.
+
+If you want the client to raise an exception for each response with a status other than 200 then please provide optional keyword argument `raise_on_unexpected_status=True`:
+
+```python
+from exasol.saas.client.openapi.api.databases import list_databases
+
+client = AuthenticatedClient(host, token, raise_on_unexpected_status=True)
+databases = list_databases.sync(client)
+````