[CookieCutter] Clarify questions
# What does this PR do?

I've seen quite some mistakes in terms of people answering the questions of the CookieCutter in the wrong way. This is because the questions are sometimes a bit vague, i.e. it's not clear whether one should provide Roberta, RoBERTa or roberta. This was actually not clear for me either.

This PR aims to clarify the questions, making sure contributors understand better what to answer.
_The documentation is not available anymore as the PR was closed or merged._