documentation for llama2 models
# What does this PR do?
Adds some documentation for 'f' models.

Fixes #25090

## Before submitting
- [X] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).

## Who can review?
@ArthurZucker 

** I'm not sure if this is even the right way to include the documentation, but let me know if there's something more to add.
_The documentation is not available anymore as the PR was closed or merged._<|||||>changes incorporated!