plugin XEP-0277: clarify a docstring for one complex method argument

src/plugins/plugin_xep_0277.py

@@ -708,13 +708,13 @@ class XEP_0277(object):
         @param session_id: id of the real-time deferred session
         @param return (tuple): (remaining, results) where:
             - remaining is the number of still expected results
-            - results is a list of tuple with
+            - results is a list of 5-tuple with
                 - service (unicode): pubsub service
                 - node (unicode): pubsub node
                 - failure (unicode): empty string in case of success, error message else
-                - items(list): list of items with:
+                - items(list[tuple(dict, list)]): list of 2-tuple with
                     - item(dict): item microblog data
-                    - comments_list(list): list of comments with
+                    - comments_list(list[tuple]): list of 5-tuple with
                         - service (unicode): pubsub service where the comments node is
                         - node (unicode): comments node
                         - failure (unicode): empty in case of success, else error message