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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 8d90fde35cc6 by Eli Bendersky in branch 'default':
Issue #15586: typo fix. This commit is accompanied by an apology for all Liechtensteiners out there, and a thanks to Eric Araujo for noticing.
http://hg.python.org/cpython/rev/8d90fde35cc6

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