[issue16954] Add docstrings for ElementTree module

[Ezio Melotti]

Ezio Melotti added the comment:

I left a few comments on rietveld.

In the rst docs the markup used for arguments is *arg*, and this is sometimes reflected in docstrings too.  We might want to do this here too, instead of using 'arg' (using 'attr' for attributes it's fine though).

> maybe docstrings should be also added in Modules/_elementtree.c?

Maybe we could have a loop that does something like cfunc.__doc__ = pyfunc.__doc__?

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stage: needs patch -> patch review

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