Update README.md

README.md

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 Sampled version of [cerebras/SlimPajama-627B](https://huggingface.co/datasets/cerebras/SlimPajama-627B).
 
-Based on the [fact that the original data was shuffled before chunking](https://huggingface.co/datasets/cerebras/SlimPajama-627B/discussions/4), I only downloaded chunk1 and further sampled 10% of the chunk.
-This should result in roughly 6B tokens, hence SlimPajama-6B.
+Based on the [fact that the original data was shuffled before chunking](https://huggingface.co/datasets/cerebras/SlimPajama-627B/discussions/4), I only downloaded chunk1 (out of 10) and further sampled 10%. This should result in roughly 6B tokens, hence SlimPajama-6B.
 
-The dataset is roughly 24GBs in storage size when decompressed and has 5489000 rows.
+The dataset is roughly 24GBs in storage size when decompressed (original dataset is over 2TBs) and has 5489000 rows.
 
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 #### Data source proportions for SlimPajama-627B and SlimPajama-6B