add impersonated settings

docs/references/transactions.rst

@@ -102,6 +102,18 @@ Because of :ref:`user_impersonation`, PostgREST sets the standard ``role``. You
 
 Additionally it also sets the ``search_path`` based on :ref:`db-schemas` and :ref:`db-extra-search-path`.
 
+.. _impersonated_settings:
+
+Impersonated Role Settings
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The :ref:`Impersonated Role <user_impersonation>` settings are applied. For example, if you do:
+
+.. code-block:: postgresql
+
+  ALTER ROLE webuser SET statement_timeout TO '5s';
+
+Every ``webuser`` request gets its queries executed with a ``statement_timeout`` of 5 seconds.
 
 .. _guc_req_headers_cookies_claims:
 

docs/releases/v11.0.0.rst

@@ -4,6 +4,11 @@
 Features
 --------
 
+Transactions
+~~~~~~~~~~~~
+
+- New :ref:`impersonated_settings`.
+
 Inserts
 ~~~~~~~