DOC: Small rewording to make the documentation easier to understand.

src/doc/tutorials/caching.rst

@@ -51,6 +51,8 @@ have entities on hand from previous queries that you want to add.
    # If you now use IDs that were in items, they are taken from the cache.
    e1 = cached_get_entity_by(eid=10001)
 
-For the cached entity getter functions (``cached_get_entity_by``) you need to set ``unique=True``.
+When filling the cache with Entity objects for ``cached_get_entity_by``, you need to set
+``unique=True``, whereas the cache for ``cached_query`` should be filled with Container object and
+``unique=False``.