[docs] Please update your ElementTree Python 2.7 docs

[Alfred Morgan]

Your 2.7 source code and your 2.7 docs are out of sync. In the source there
are many methods that have the `namespaces` argument and it doesn't show up
documented at all in your docs other than one example that uses this
undocumented argument.

example:

"findall(*match*)" in the docs:

https://docs.python.org/2.7/library/xml.etree.elementtree.html

"def findall(self, path, namespaces=None):" in the source code:

https://hg.python.org/cpython/file/2.7/Lib/xml/etree/ElementTree.py

-alfred
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