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

[INADA Naoki]

INADA Naoki added the comment:

> It's the tutorial.  Probably better to just leave it alone.  Precise understanding can come later.

I agree.
Beginner should start using dict with builtin immutable type as key.
hashable is too complex at this point.

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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29089>
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