Update clustering-visualizing-word-embeddings.md

[anisa-hawes]

I am removing the duplicate title in recently published /en/lessons/clustering-visualizing-word-embeddings.

Closes #3033

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[anisa-hawes]

Hello @charlottejmc,

This is another opportunity for you to practice providing a PR review. I've written a step-by-step for you here, which you can refer back to for guidance.

In this case, I am making one very minor change to one file. There is only one page of the website to check in the Netlify Preview, and only one file to review for edits in Files Changed tab.

As titles are displayed prominently in our lesson headers, we don't require them to be repeated after the table of contents. This PR is to remove the duplicate title from Clustering and Visualising Documents using Word Embeddings.

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I'm tagging @hawc2 here to keep him updated with this typesetting tweak. (Apologies for missing this in my review of your publication PR, Alex).