Update README.md

README.md

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 # Metric Card for Perplexity
 
-> This is a fork of the huggingface evaluate library's implementation of perplexity. 
+> **This is a fork of the huggingface evaluate library's implementation of perplexity.**
 
 
-## Metric DescriptionGiven a model and an input text sequence, perplexity measures how likely the model is to generate the input text sequence.
+## Metric Description
+
+Given a model and an input text sequence, perplexity measures how likely the model is to generate the input text sequence.
 
 As a metric, it can be used to evaluate how well the model has learned the distribution of the text it was trained on.