[docs] [issue29089] dictionary keys described incorrectly in tutorial

[R. David Murray]

R. David Murray added the comment:

It is not wrong.  It does not say that keys are limited to immutables, only that immutables can be keys.  Perhaps the sentence about a tuple pointing to a mutable could be tightened up, though, by saying that if a tuple points to something that can not itself be a dictionary key, then that tuple can not be a dictionary key.

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<http://bugs.python.org/issue29089>
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