Add example for `loo_score()`

Need to add a more in-depth example using the `loo_score()` function and add a link in the `loo_score()` docstring to the EABM chapter.

Locate the `loo_score()` documentation and the EABM chapter referenced in the issue. Read the existing examples first, then add a more in-depth example and link the chapter from the `loo_score()` docstring. Done means both the example and docstring link are present and the documentation renders correctly.

Written by the indexing model from the issue text.