Rename Arrhenius reference temperature to Equilibrium

[boulderdaze]

This PR:

• Renames Arrhenius reference temperature to Equilibrium to address the feedback from Matt
• Adds Henry's Law constant equation in the comment in configuration requested by Mary

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.03%. Comparing base (3d13e2d) to head (4f745da).

Files with missing lines	Patch %	Lines
src/v1/aerosol/parsers.cpp	83.33%	1 Missing ⚠️
src/v1/aerosol/schema.cpp	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   88.03%   88.03%           
=======================================
  Files          44       44           
  Lines        2474     2474           
=======================================
  Hits         2178     2178           
  Misses        296      296           

Files with missing lines	Coverage Δ
src/v1/aerosol/parsers.cpp	85.00% <83.33%> (ø)
src/v1/aerosol/schema.cpp	78.23% <80.00%> (ø)

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[K20shores]

Are there docs for this in mechanism configuration? If so we should update them