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

[Roundup Robot]

Roundup Robot added the comment:

New changeset fc66730dae4c by Eli Bendersky in branch 'default':
Issue #15586: add some examples to ElementTree documentation. Patch by Daniel Ellis.
http://hg.python.org/cpython/rev/fc66730dae4c

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nosy: +python-dev

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