[docs] [issue16954] Add docstrings for ElementTree module

[Eli Bendersky]

Eli Bendersky added the comment:

Definitely. And this is one of those issues where I can wholeheartedly say that patches are welcome :-)

Even incremental patching will be OK (i.e. patches documenting single methods or groups of methods).

Incidentally, while replacing the comment by docstring for issue #14377, I noticed an argument (default_namespace) that wasn't documented anywhere, including the ReST docs. So such a transition can have more benefits than seems on the surface.

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keywords: +easy

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