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

[Daniel Ellis]

Daniel Ellis added the comment:

Thank you for the review Eli.  I've made your changes and attached the updated patch.  I did run all of the code snippets that are being added on 2.7, and the only thing I found different was the changed print statement.  I don't believe I overlooked anything, but I may have made a mistake.

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Added file: http://bugs.python.org/file26802/2.7_branch_etree_doc_2.patch

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