Fill in a little more documentation

[dwhswenson]

A few spots that seemed empty once I was actually looking at the API docs on RTD.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (f5862a2) 91.44% compared to head (520525e) 91.44%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   91.44%   91.44%           
=======================================
  Files           7        7           
  Lines         526      526           
=======================================
  Hits          481      481           
  Misses         45       45           

Files	Coverage Δ
exorcist/taskdb.py	97.48% <ø> (ø)

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[dwhswenson]

Looks like we're triggering PR builds, but not reporting that back as a GitHub status check. I had some trouble with permissions between the OpenFE org and my RTD account, and ended up setting up webhooks manually.

@mikemhenry (or possibly @Yoshanuikabundi) : Do you know the magic to correctly set up PR builds with status checks? You should both have invites to the Exorcist RTD.

[dwhswenson]

close/open cycle to see if this works now that @Yoshanuikabundi did some magic to the webhook

[dwhswenson]

I'm gonna say that adding 3 docstrings doesn't require a review, and just merge this now. Main purpose of this PR was actually to check RTD/GitHub integration worked (which it now does!)