[docs] [issue16954] Add docstrings for ElementTree module

[Ezio Melotti]

Ezio Melotti added the comment:

> (or maybe this is just a use-your-common-sense thing)

That's probably the best thing.  I don't think we follow any specific convention for args in the docstring.  Mostly they are just described in the text, without having lists of args.

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<http://bugs.python.org/issue16954>
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