[DOC] Fixed</li> tags appearance on the end on list in partition clustering notebook

[kavya-r30]

Reference Issues/PRs

Fixes #2503

What does this implement/fix? Explain your changes.

Removes the extra tag which appeared in partition clustering notebook

Does your contribution introduce a new dependency? If yes, which one?

No

Any other comments?

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[kavya-r30]

@baraline I think i have fixed the tag appearance in partition clustering notebook
Can you please review it once you find time. Thank you...

[baraline]

I can confirm that the tags are gone now that you changed the list syntax to avoid using tags. Thanks !