First pass attempt at addressing #350

[AndrewAnnex]

I probably will do another pass or two of this, but did a number of (approx 84) adjustments to doc strings to include unit descriptions for input or output parameters to address #350. Likely missed some and through time improved consistency in how I refer to ET parameters would be a good idea.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (6d0168e) to head (5774ba3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #491   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          13       13           
  Lines       15635    15635           
=======================================
  Hits        15614    15614           
  Misses         21       21           

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