Document the Negative binomial gibbs sampler

[rlouf]

In this PR I add some documentation to the existing gibbs samplers, and minor simplifications to the API.

[codecov]

Codecov Report

Merging #9 (dbdcf61) into main (5edcecd) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #9   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           99        99           
  Branches         6         6           
=========================================
  Hits            99        99           

Impacted Files	Coverage Δ
aemcmc/negative_binomial_horseshoe_gibbs.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5edcecd...dbdcf61. Read the comment docs.

[zoj613]

Looks good, aside from the error in lambda's exponent in the model specification docstring.

[rlouf]

Thank you for the review. I included the changes you suggested. Ready to merge on my end (I need an approving review to be able to merge the PR).

[zoj613]

Thank you for the review. I included the changes you suggested. Ready to merge on my end (I need an approving review to be able to merge the PR).

done, in case you didnt see the approval.

[rlouf]

Yes thank you, I don't have merging rights on this repo unfortunately.

[zoj613]

Yes thank you, I don't have merging rights on this repo unfortunately.

Cc @brandonwillard

I'll merge it myself in the meantime.

[zoj613]

Thanks @rlouf