Documented some undocumented related_list params

ckan/logic/action/get.py

@@ -188,6 +188,16 @@ def related_list(context, data_dict=None):
     :type id: string
     :param dataset: dataset dictionary of the dataset (optional)
     :type dataset: dictionary
+    :param type_filter: the type of related item to show (optional,
+      default: None, show all items)
+    :type type_filter: string
+    :param sort: the order to sort the related items in, possible values are
+      'view_count_asc', 'view_count_desc', 'created_asc' or 'created_desc'
+      (optional)
+    :type sort: string
+    :param featured: whether or not to restrict the results to only featured
+      related items (optional, default: False)
+    :type featured: bool
 
     :rtype: list of dictionaries