Add comments about the redshift correction

[jeremykubica]

Add comments to prevent future confusion (and having to re-derive the formulas)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.19%. Comparing base (72fdad4) to head (6eea2f7).
⚠️ Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
- Coverage   91.22%   91.19%   -0.03%     
==========================================
  Files          61       61              
  Lines        4899     4952      +53     
==========================================
+ Hits         4469     4516      +47     
- Misses        430      436       +6     

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[github-actions]

Before [6da7ad8]	After [ffd9bcd]	Ratio	Benchmark (Parameter)
544±2μs	569±6μs	1.05	benchmarks.TimeSuite.time_apply_passbands
12.5±0.2μs	13.0±0.09μs	1.04	benchmarks.TimeSuite.time_sample_x1_from_hostmass
4.60±0.07ms	4.71±0.07ms	1.03	benchmarks.TimeSuite.time_lightcurve_source
108±1μs	111±0.7μs	1.03	benchmarks.TimeSuite.time_sample_x0_from_distmod
88.0±2μs	89.6±0.8μs	1.02	benchmarks.TimeSuite.time_make_and_evaluate_step_model
29.2±0.2μs	29.7±0.2μs	1.02	benchmarks.TimeSuite.time_make_simple_linear_wavelength_model
33.0±0.3ms	33.3±0.6ms	1.01	benchmarks.TimeSuite.time_additive_multi_model_source
19.3±0.3ms	19.6±0.2ms	1.01	benchmarks.TimeSuite.time_chained_evaluate_sed
4.41±0.09ms	4.45±0.05ms	1.01	benchmarks.TimeSuite.time_evaluate_salt3_passbands
8.00±0.02ms	8.06±0.04ms	1.01	benchmarks.TimeSuite.time_load_passbands

Click here to view all benchmarks.