Document [/tests/test_fre_catalog.py](https://github.com/NOAA-GFDL/fre-cli/blob/main/fre/catalog/tests/test_fre_catalog.py) Use this as a guide: https://docs.google.com/document/d/1gcAumbCS3kySOeyr285Www3Dtdy4kUtoh3BYlsslRJ8/edit?tab=t.0
