Fix broken links in docs/nnx/mnist_tutorial.md

[bionicles]

pointed to prev location

What does this PR do?

fixes a couple of broken links to the notebook for the mnist tutorial

Fixes # (issue)

Checklist

• [x] This PR fixes a minor issue (e.g.: typo or small bug) or improves the docs (you can dismiss the other checks if that's the case).
• [ ] This change is discussed in a Github issue/ discussion (please add a link).
• [x] The documentation and docstrings adhere to the documentation guidelines.
• [ ] This change includes necessary high-coverage tests. (No quality testing = no merge!)

I personally checked the fixed links: https://colab.research.google.com/github/google/flax/blob/main/docs/nnx/mnist_tutorial.ipynb https://github.com/google/flax/blob/main/docs/nnx/mnist_tutorial.ipynb

both worked after adding /nnx/ between /docs/ and mnist_tutorial.ipynb

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[bionicles]

like this? i didnt check the other nnx notebooks, they might need fixes also, checking ...

[bionicles]

didn't see any links in the other notebooks in the docs/nnx folder

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.00%. Comparing base (31adb00) to head (d4d9293). Report is 78 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #4060    +/-   ##
======================================
  Coverage   0.00%   0.00%            
======================================
  Files        106     107     +1     
  Lines      13582   13824   +242     
======================================
- Misses     13582   13824   +242     

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