[docs] [issue29453] Remove reference to undefined dictionary ordering in Tutorial

[Raymond Hettinger]

Raymond Hettinger added the comment:

>> But maybe it is worth to mention that the output 
>> corresponds to the order of passed keyword arguments
 
> Should I add this note? 

Yes, please.  This is a section on keyword arguments, making it the preferred place to mention the new guaranteed output order.

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<http://bugs.python.org/issue29453>
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