gh-39222: Remove outdated note from docstring of `cliques_maximal`
    
Sage no longer sorts the output of [cliques_maximal](https://doc-develop
--sagemath.netlify.app/html/en/reference/graphs/sage/graphs/graph.html#s
age.graphs.graph.Graph.cliques_maximal) since commit
5b0c7b4.

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- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
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preview.
    
URL: #39222
Reported by: Lennard Hofmann
Reviewer(s): David Coudert

Author: Release Manager

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