fix readme

Signed-off-by: dimapihtar <[email protected]>

Author: dimapihtar

megatron/training/datasets/README.md

@@ -11,17 +11,11 @@ It probabilistically converts samples into FIM format using configurable rates,
 **Attributes**
 
 - `rate`: Probability of converting a sample into a FIM example.
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 - `spm_rate`: Probability of using the SPM FIM pattern (vs PSM).
-
 - `extra_tokens`: Dictionary containing the FIM special tokens: {"prefix", "middle", "suffix", "pad", "eod"}.
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 - `split_sample`: Optional token around which samples are split before applying FIM.
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 - `fragment_rate`: Probability of applying FIM to each fragment when split_sample is used.
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 - `no_prefix`: If the decoded sequence starts with this prefix, FIM is skipped.
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 `GPTFIMDataset` dataset class that loads token sequences from an `IndexedDataset` and applies FIM transformations before returning each sample.
 
 **PSM Format**
@@ -37,5 +31,4 @@ It probabilistically converts samples into FIM format using configurable rates,
 **Special cases:**
 
 - If the sequence starts with no_prefix, FIM is skipped.
-
 - If FIM is not applied, the sample is returned unchanged.