doc: remove statement about 'with'

Avoid confusion, as the editors don't come with context managers.

modules/mol/base/doc/editors.rst

@@ -28,12 +28,8 @@ the destructor, this reference count is decremented. When the count drops to
 zero, the dependent information is updated.
 
 In Python, one can not rely on the destructors being called. It is advised to 
-always put a call to :meth:`XCSEditor.UpdateICS` or 
-:meth:`ICSEditor.UpdateXCS` when the editing is finished. Alternatively, 
-starting from Python version 2.6, one can use the \
-`with <http://docs.python.org/reference/compound_stmts.html#with>`_  
-statement to make sure the destructor are called and the dependent information 
-is updated.
+always put a call to :meth:`XCSEditor.UpdateICS` or
+:meth:`ICSEditor.UpdateXCS` when the editing is finished.
 
 
 Basic Editing Operations