fix: update broken `nbviewer` path to the notebook

[mertgulexe]

Problem

The lesson "LangChain Multi-Query for RAG" has the wrong link to nbviewer.

Solution

The broken link should be changed.

Type of Change

• [x] 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)
• [ ] Non-code change (docs, etc)
• [ ] None of the above: (explain here)

Test Plan

One can change the last part of the broken nbviewer link from
08-langchain-multi-query.ipynb to 10-langchain-multi-query.ipynb.

[review-notebook-app[bot]]

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