[DOC] PLA Notebook

[Moonzyyy]

What does this implement/fix? Explain your changes.

Adds PLA as a notebook inside of the transformer examples

[review-notebook-app]

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#45FD64}{\textsf{examples}}$ ]. Feel free to change these if they do not properly represent the PR.

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