Remove stable from the docs

Author: pablogsal

Doc/library/functools.rst

@@ -663,7 +663,7 @@ The :mod:`functools` module defines the following functions:
 
    .. method:: static_order()
 
-      Returns an iterable of nodes in a stable topological order. Using this method
+      Returns an iterable of nodes in a topological order. Using this method
       does not require to call :meth:`TopologicalSorter.prepare` or
       :meth:`TopologicalSorter.done`. This method is equivalent to::
 

Lib/functools.py

@@ -413,7 +413,7 @@ def _find_cycle(self):
         return None
 
     def static_order(self):
-        """Returns an iterable of nodes in a stable topological order.
+        """Returns an iterable of nodes in a topological order.
 
         Using this method does not require to call "prepare" or "done". If any
         cycle is detected, :exc:`CycleError` will be raised.