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

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +eli.bendersky, scoder
stage:  -> patch review

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