[issue33187] Document ElementInclude (XInclude) support in ElementTree

[Shantanu]

Change by Shantanu <hauntsaninja at gmail.com>:


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nosy: +hauntsaninja
nosy_count: 6.0 -> 7.0
pull_requests: +19694
pull_request: https://github.com/python/cpython/pull/20438

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33187>
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