Remove outdated note from docstring

Sage no longer sorts the output since commit 5b0c7b4

Author: Ordoviz

src/sage/graphs/graph.py

@@ -5823,12 +5823,6 @@ def cliques_maximal(self, algorithm='native'):
           implementation of the Bron and Kerbosch Algorithm [BK1973]_
 
 
-        .. NOTE::
-
-            This method sorts its output before returning it. If you prefer to
-            save the extra time, you can call
-            :class:`sage.graphs.independent_sets.IndependentSets` directly.
-
         .. NOTE::
 
             Sage's implementation of the enumeration of *maximal* independent