docs: fix broken link to SelfAttention

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes broken link and so blocked CI

This pull request includes a small but important update to a URL in the MHAttention.py file. The change updates a link to a more accurate source for visualizing self-attention mechanisms.

• course_UvA-DL/05-transformers-and-MH-attention/MHAttention.py: Updated the URL for "Illustrated: Self-Attention" to a more appropriate link on Medium.

PR review

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[Copilot]

Pull Request Overview

This PR fixes a broken link in the documentation section of the MHAttention module by updating the URL for the Self-Attention visualization.

• Updated the Self-Attention link in the documentation comments.
• Ensured the new link directs to the correct page for visualization.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69%. Comparing base (773cb27) to head (83a525b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #384 +/- ## =================================== Coverage 69% 69% =================================== Files 2 2 Lines 441 441 =================================== Hits 306 306 Misses 135 135 

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