remove nlp documentation

[dimapihtar]

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What does this PR do ?

Removes nlp documentation since nlp collection was fully removed from NeMo.

Collection: [Note which collection this PR will affect]

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[github-actions]

[🤖]: Hi @dimapihtar 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc