Remove units from roman data model outputs

[schlafly]

This PR removes the units from output data models, to reflect changes in rad / roman_datamodels that remove units there.

It also includes two extraneous doc fixes (sorry!)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.08%. Comparing base (81028a8) to head (9eccf21).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
+ Coverage   89.24%   91.08%   +1.83%     
==========================================
  Files          17       16       -1     
  Lines        2073     2119      +46     
==========================================
+ Hits         1850     1930      +80     
+ Misses        223      189      -34     

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[schlafly]

@zacharyburnett , does this MacOS python 3.13 failure make sense to you? We once barred python >= 3.13, but somehow the MacOS job wants to use it and then fails.

[zacharyburnett]

Yeah, looks like when unpinned, Tox grabs the latest Python without checking if the project can support it, and the install fails because romanisim explicitly doesn't want 3.13; we should test unpinning Python (see #167), and if that doesn't work change the toxenv in the CI to py312-xdist