Typo in adding_a_new_model README
There's a typo in the adding_a_new_model README [file](https://github.com/huggingface/transformers/blob/main/templates/adding_a_new_model/README.md), 

It would be `make fix-copies`, not `maxke fix-copies` here
![image](https://user-images.githubusercontent.com/43698245/173199900-0489726e-3373-4567-ac41-96240c41b230.png)
 
Sent a PR to fix this [here](https://github.com/huggingface/transformers/pull/17679)