More work on doxygen doc

[johannct]

• SED class

[codecov]

Codecov Report

Attention: Patch coverage is 40.42553% with 28 lines in your changes missing coverage. Please review.

Project coverage is 58.97%. Comparing base (8899085) to head (3accdf1).

Files with missing lines	Patch %	Lines
src/lib/cosmology.cpp	52.00%	12 Missing ⚠️
src/lib/SED.cpp	0.00%	9 Missing ⚠️
src/lib/_bindings.cc	0.00%	5 Missing ⚠️
src/lib/SEDLib.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
+ Coverage   58.91%   58.97%   +0.05%     
==========================================
  Files          50       50              
  Lines        6477     6464      -13     
  Branches      947      947              
==========================================
- Hits         3816     3812       -4     
+ Misses       2661     2652       -9     

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