Fix class name of symbolic link
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_5126). All of your documentation changes will be reflected on that endpoint. I have removed the reference to the Issue in the PR title, so that we avoid to have both references (to the issue and to the PR) in the merge commit to the main branch.

Instead, it should be commented in the PR description, so that the PR is appropriately linked by GitHub to its corresponding Issue:

> Fix #5098. @albertvillanova What should I test in your opinion? Also, where should I save the test file and how should I name it? Thanks for your support The regression test to be implemented should test what your PR fixes: that is, that `_resolve_single_pattern_locally` function does not resolve any symbolic link when passed a directory that does contain any.

As you are testing a function in `data_files.py`, the corresponding test should be in `tests/test_data_files.py`.

You could name the test something lilke: `test_resolve_single_pattern_locally_does_not_resolve_symbolic_links`

You could take inspiration from other tests there in that file.
Fix #5098 