Example in documentation showing color computation for a reddened source

[hhsieh00]

adding new example to spectroscopy documentation for computing the color of a reddened source in specified filters from sbpy.photometry.bandpass

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.81%. Comparing base (59a8a49) to head (46cecae).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #446   +/-   ##
=======================================
  Coverage   81.81%   81.81%           
=======================================
  Files          53       53           
  Lines        4267     4267           
=======================================
  Hits         3491     3491           
  Misses        776      776           

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[hhsieh00]

@mkelley Okay, ready for review! I'd note that running sun = Sun.from_builtin("calspec") returns AstropyDeprecationWarning warnings, but that seems like it might be an issue to deal with separately.

[mkelley]

A few comments. I'll fix that deprecation warning.

[hhsieh00]

Thanks for the comments, @mkelley . Ready for another look.

[mkelley]

Thanks!