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

[Anjali Bansal]

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

Thank you for the information. I had started working on this issue. You can assign it to me if needed. I will create a PR soon.
Github Username: bansalanjali2512

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