Fill in docstrings for functions in config.py and tests/utils.py

[singlesp]

Relates to #358. I will next work on docstrings only in cubids src code.

Changes proposed in this pull request

• updates docstrings for config.py and tests/utils.py

Documentation that should be reviewed

• config.py and tests/utils.py

[tsalo]

The docstrings look solid, but I prefer to have the summary line on the same line as the quotes. E.g.,

"""Do something.

...
"""

instead of

"""
Do something.

...
"""

[singlesp]

thanks @tsalo - made the changes

[tsalo]

LGTM! I changed the PR title to be a bit clearer about the scope of the changes.