[docs] [issue15586] Provide some examples for usage of ElementTree methods/attributes

[Eli Bendersky]

Eli Bendersky added the comment:

Daniel, this looks good except that the section numbering is different from 3.3 where the object/function reference sections were nested under "Reference". Could you fix your patch to align the 2.7 doc to this structure?

P.S. Éric's comment also has to be fixed ;)

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<http://bugs.python.org/issue15586>
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