[docs] [issue28234] In xml.etree.ElementTree docs there are many absent Element class links

[Martin Panter]

Martin Panter added the comment:

Mostly looks good to me. I left some comments on the code review.

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nosy: +martin.panter
versions: +Python 2.7, Python 3.5, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28234>
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