Fix: Update link to point to `splade-quora.ipynb`

[justin-thurman]

Problem

In the notebook splade-vector-generation.ipynb, there's a link to another notebook, splade-quora.ipynb. This link currently 404s.

Solution

This PR updates the link to point to the correct location of the splade-quora.ipynb notebook.

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] Infrastructure change (CI configs, etc)
• [x] Non-code change (docs, etc)
• [ ] None of the above: (explain here)

Test Plan

I followed the updated link and verified that it points to the correct notebook.