[docs] [issue2864] etree: Add XPath documentation

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

There's another issue about lack of documentation on this topic.
See #6488.

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assignee: docs at python -> 
resolution:  -> duplicate
status: open -> closed
superseder:  -> ElementTree documentation refers to "path" with no explanation, and inconsistently

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2864>
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