Update model card

README.md

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 # Math-RoBerta for NLP tasks in math learning environments
 
-This model is fine-tuned with GPT-xl with over 3,000,000 posts and replies from students and instructors in Algebra Nation (https://www.mathnation.com/). It was trained to allow researchers to control generated responses' safety using tags `[SAFE]` and `[UNSAFE]`
+This model is fine-tuned with GPT2-xl with over 3,000,000 posts and replies from students and instructors in Algebra Nation (https://www.mathnation.com/). It was trained to allow researchers to control generated responses' safety using tags `[SAFE]` and `[UNSAFE]`
 
 ### Here is how to use it with texts in HuggingFace
 ```python