[docs] [issue33187] Document ElementInclude (XInclude) support in ElementTree

[Anjali Bansal]

Anjali Bansal <anjali.mca17.du at gmail.com> added the comment:

Hello, 

I had created the PR for this issue. Please review and let me know if any modification required.

GitHub PR: https://github.com/python/cpython/pull/8861

bpo-33187: Fix document ElementInclude (XInclude) support in ElementTree issue.

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