Chapter 1: Default Models of the pipeline function

In the video:
Chapter 1 Live Session with Sylvain
https://youtu.be/aV4wfnIakSQ?t=928

There a question of what are the default models in the pipeline library.
His answer is to look at:
https://github.com/huggingface/transformers/blob/main/src/transformers/pipelines/__init__.py

I think that this information should be in the chapter 1, also on the documentation