Adding docstrings

[immasushiroll]

Hello! First time contributing, sorry it took so long, I figured these changes aren't that important as they're all comments.

This is a first draft and a low impact PR, so feel free to point out if I my descriptions don't accurately reflect the functional logic, thank you so much for your time and help!

You may see some of the .csv files have changed or have been added. Those were generated from running updater.py, which pulls the latest updates from the APOBEC DRMS database. Basically, I updated the .csv files to a more recent version, I can remove those changes if it's preferred for a cleaner PR.

When I go to test run sierralocal with these changes (specifically the new .csv files) I get the following where it considers it an "unusual file". Would be great if someone could take a look at this just in case, not sure if this behaviour is expected. Test run w/ added docstring changes:

l(.venv) [immasushiroll@kallisto sierra-local]$ sierralocal RT.fa
searching path /home/immasushiroll/Windows/Users/jane8/repos/sierra-local/.venv/lib/python3.14/site-packages/sierralocal/data/HIVDB*.xml
searching path /home/immasushiroll/Windows/Users/jane8/repos/sierra-local/.venv/lib/python3.14/site-packages/sierralocal/data/apobec_drms.json
HIVdb version 9.4
Using unusual file: /home/immasushiroll/Windows/Users/jane8/repos/sierra-local/.venv/lib/python3.14/site-packages/sierralocal/data/rx-all_subtype-all.csv
Using SDRM mutations file: /home/immasushiroll/Windows/Users/jane8/repos/sierra-local/.venv/lib/python3.14/site-packages/sierralocal/data/sdrms_hiv1.csv
Using mutation type file: /home/immasushiroll/Windows/Users/jane8/repos/sierra-local/.venv/lib/python3.14/site-packages/sierralocal/data/mutation-type-pairs_hiv1.csv
Using APOBEC file: /home/immasushiroll/Windows/Users/jane8/repos/sierra-local/.venv/lib/python3.14/site-packages/sierralocal/data/apobecs.csv
Aligning using post-align
Aligned RT.fa
100 sequences found in file RT.fa.
Writing JSON to file RT_results.json
Time elapsed: 9.4609 seconds (10.682 it/s)

[ArtPoon]

Thanks @immasushiroll - can you please remove the data/ files from your commit? We want to avoid overwriting those defaults. I know it's a pain to have them there.

[immasushiroll]

@ArtPoon done! changes in data just completely removed, that should be easiest, did you also want to squash those commits?