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update arxiv link with arxiv id

README.md

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 # Model description
 
-paper: [Characterizing Verbatim Short-Term Memory in Neural Language Models](https://doi.org/10.48550/arXiv.2210.13569)
+paper: [Characterizing Verbatim Short-Term Memory in Neural Language Models](https://arxiv.org/abs/2210.13569)
 
 This is a gpt2-small-like decoder-only transformer model trained on a 40M token subset of the [wikitext-103 dataset](https://paperswithcode.com/dataset/wikitext-103).