correct the doc after switching move_double on

Author: mili1247

doc/guide/step_by_step.rst

@@ -293,10 +293,6 @@ Other parameters include:
 
 The complete list of parameters is available :doc:`here <../_ref/triqs_ctseg.solver.Solver.solve>`.
 
-.. note::
-
-The moves ``double_insert_segment`` and ``double_remove_segment`` are off by default. They may be switched on by the user when solving impurities with strong attractive interactions to improve ergodicity. 
-
 Step 4 - Run the solver 
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