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

[py.user]

py.user added the comment:

> I left some comments on the code review.
Left an answer on a comment. (ISTM, email notification doesn't work there, I didn't get email.)

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