Update docstrings again

[marcpaterno]

This updates more docstrings (and some type annotations).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.3%. Comparing base (71504b5) to head (90b83aa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #429 +/- ## ====================================== Coverage 98.3% 98.3% ====================================== Files 47 47 Lines 3352 3356 +4 ====================================== + Hits 3296 3300 +4 Misses 56 56 ``` | [Files](https://app.codecov.io/gh/LSSTDESC/firecrown/pull/429?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [firecrown/connector/cobaya/ccl.py](https://app.codecov.io/gh/LSSTDESC/firecrown/pull/429?src=pr&el=tree&filepath=firecrown%2Fconnector%2Fcobaya%2Fccl.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-ZmlyZWNyb3duL2Nvbm5lY3Rvci9jb2JheWEvY2NsLnB5) | `100.0% <100.0%> (ø)` | | | [firecrown/connector/cobaya/likelihood.py](https://app.codecov.io/gh/LSSTDESC/firecrown/pull/429?src=pr&el=tree&filepath=firecrown%2Fconnector%2Fcobaya%2Flikelihood.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-ZmlyZWNyb3duL2Nvbm5lY3Rvci9jb2JheWEvbGlrZWxpaG9vZC5weQ==) | `100.0% <100.0%> (ø)` | | | [firecrown/connector/cosmosis/likelihood.py](https://app.codecov.io/gh/LSSTDESC/firecrown/pull/429?src=pr&el=tree&filepath=firecrown%2Fconnector%2Fcosmosis%2Flikelihood.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-ZmlyZWNyb3duL2Nvbm5lY3Rvci9jb3Ntb3Npcy9saWtlbGlob29kLnB5) | `97.3% <100.0%> (+<0.1%)` | :arrow_up: | | [firecrown/connector/mapping.py](https://app.codecov.io/gh/LSSTDESC/firecrown/pull/429?src=pr&el=tree&filepath=firecrown%2Fconnector%2Fmapping.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-ZmlyZWNyb3duL2Nvbm5lY3Rvci9tYXBwaW5nLnB5) | `100.0% <100.0%> (ø)` | | | [firecrown/generators/inferred\_galaxy\_zdist.py](https://app.codecov.io/gh/LSSTDESC/firecrown/pull/429?src=pr&el=tree&filepath=firecrown%2Fgenerators%2Finferred_galaxy_zdist.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-ZmlyZWNyb3duL2dlbmVyYXRvcnMvaW5mZXJyZWRfZ2FsYXh5X3pkaXN0LnB5) | `100.0% <ø> (ø)` | |