Outdate GitHub REST API rate limit documentation URL

In [5. The 🤗 Datasets library- Creating your own dataset - Creating your own dataset](https://huggingface.co/learn/nlp-course/chapter5/5?fw=pt), there is a link to the GitHub REST API rate limit that is outdated.

The current one is: https://docs.github.com/en/rest/overview/resources-in-the-rest-api#rate-limiting

The new one is: https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api#primary-rate-limit-for-unauthenticated-users