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

[underscore_asterisk]

underscore_asterisk <ap.goel98 at gmail.com> added the comment:

Hello,

Can I take this up? I will create a PR either later today or tomorrow.

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nosy: +underscore_asterisk

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