docs: improve docs for MinHashDedup Step

[anakin87]

👋

While looking at this nice feature, I noticed some errors in the docstring and I'm trying to fix them.

Slightly related feedback
Initially I was bit surprised that I cannot easily understand why a single text element is considered a duplicate when using this technique, while this is transparent using EmbeddingGeneration + EmbeddingDedup.
But I understand that this technique is more complex, even from the implementation point of view...

@gabrielmbmb @plaguss

[anakin87]

I think this detail is not needed after #937

[codspeed-hq]

CodSpeed Performance Report

Merging #1050 will not alter performance

_{Comparing anakin87:improve-minhash-docs (9ccda5e) with main (844165f)}

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Summary

✅ 1 untouched benchmarks