docs: Add obs_frontend_get_user_config

docs/sphinx/reference-frontend-api.rst

@@ -736,12 +736,29 @@ Functions
 
 ---------------------------------------
 
+.. deprecated:: 31.0
 .. function:: config_t *obs_frontend_get_global_config(void)
 
    :return: The config_t* associated with the global config (global.ini)
 
 ---------------------------------------
 
+.. function:: config_t *obs_frontend_get_app_config(void)
+
+   :return: The config_t* associated with system-wide settings (global.ini)
+
+   .. versionadded:: 31.0
+
+---------------------------------------
+
+.. function:: config_t *obs_frontend_get_user_config(void)
+
+   :return: The config_t* associated with user settings (user.ini)
+
+   .. versionadded:: 31.0
+
+---------------------------------------
+
 .. function:: void obs_frontend_set_streaming_service(obs_service_t *service)
 
    Sets the current streaming service to stream with.