First Pass Documentation (docstrings) For Latent Folder

[AFg6K7h4fhy2]

This pull request includes a first pass

• Correction and or modifications of existing docstrings in ./model/src/pyrenew/latent
• Addition of new docstrings in ./model/src/pyrenew/latent

Note: You will find some TODO placeholders, mostly in the Notes section of some docstrings. These occur where the author was uncertain about standard procedure or the content.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.45%. Comparing base (5dccc03) to head (0710c3a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   90.28%   90.45%   +0.17%     
==========================================
  Files          26       28       +2     
  Lines         535      545      +10     
==========================================
+ Hits          483      493      +10     
  Misses         52       52              

Flag	Coverage Δ
unittests	90.45% <100.00%> (+0.17%)	⬆️

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[gvegayon]

Overall it looks good. Ping me when the comments/discussions are addressed

[gvegayon]

All looks good, @AFg6K7h4fhy2. I took care of a few things were requested and created an issue for another (#79). Will merge this and continue with the others.