Drop out-of-date docstrings.

python/lsst/daf/butler/_butler.py

@@ -1677,13 +1677,6 @@ def query_datasets(
             collection wildcard is passed when ``find_first`` is `True`, or
             when ``collections`` is `None` and default butler collections are
             not defined.
-
-        Notes
-        -----
-        When multiple dataset types are queried in a single call, the results
-        of this operation are equivalent to querying for each dataset type
-        separately in turn, and no information about the relationships between
-        datasets of different types is included.
         """
         if data_id is None:
             data_id = DataCoordinate.make_empty(self.dimensions)

python/lsst/daf/butler/queries/_query.py

@@ -240,8 +240,7 @@ def datasets(
             If `True` (default), for each result data ID, only yield one
             `DatasetRef` of each `DatasetType`, from the first collection in
             which a dataset of that dataset type appears (according to the
-            order of ``collections`` passed in).  If `True`, ``collections``
-            must not be ``...``.
+            order of ``collections`` passed in).
 
         Returns
         -------