Update method docstring

theano/gof/fg.py

@@ -219,16 +219,11 @@ class FunctionGraph(utils.object2):
 
     def disown(self):
         """
-        WRITEME
         Cleans up all of this FunctionGraph's nodes and variables so they are
         not associated with this FunctionGraph anymore.
 
         The FunctionGraph should not be used anymore after disown is called.
 
-        This may not clean everything this FunctionGraph's features set in the
-        nodes and variables. If there are no features, this should set
-        them back to what they were originally.
-
         """
         for f in self._features:
             self.remove_feature(f)