Fix TypeError in simple_audio.ipynb

[MahdiHakkakan]

change x = data_dir/'no/01bb6a2a_nohash_0.wav'
to x = data_dir+'/no/01bb6a2a_nohash_0.wav'
to prevent a TypeError at line 819, caused by attempting to concatenate a Path object with a string.

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[github-actions]

Preview

Preview and run these notebook edits with Google Colab:

• site/en/tutorials/audio/simple_audio.ipynb

Rendered notebook diffs available on ReviewNB.com.

Format and style

Use the TensorFlow docs notebook tools to format for consistent source diffs and lint for style:

$ python3 -m pip install -U --user git+https://github.com/tensorflow/docs

$ python3 -m tensorflow_docs.tools.nbfmt notebook.ipynb

$ python3 -m tensorflow_docs.tools.nblint --arg=repo:tensorflow/docs notebook.ipynb

If commits are added to the pull request, synchronize your local branch: git pull origin patch-1

[MarkDaoust]

Path/str is legal.
This notebook is failing at a bunch of other places.

We can only accept changes it it runs in colab top-to bottom.

[github-actions]

Marking this pull request as stale since it has been open for 14 days with no activity. This PR will be closed if no further activity occurs.