Update features.md

[ljhwang]

More editing for clarity.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (180ea68) 93.12% compared to head (ffbe304) 93.12%.
Report is 2 commits behind head on main.

Additional details and impacted files

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##             main     #614   +/-   ##
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  Coverage   93.12%   93.12%           
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  Files          92       92           
  Lines        6324     6324           
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  Hits         5889     5889           
  Misses        435      435           

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	0.972 ± 0.004 (s=468)	0.971 ± 0.004 (s=461)	-0.2% .. +0.0%
Slab interpolation curved simple none	0.970 ± 0.004 (s=470)	0.970 ± 0.003 (s=460)	-0.1% .. +0.1%
Spherical slab interpolation simple none	1.127 ± 0.006 (s=390)	1.128 ± 0.006 (s=411)	-0.1% .. +0.2%
Slab interpolation simple curved CMS	0.992 ± 0.013 (s=485)	0.992 ± 0.014 (s=425)	-0.3% .. +0.3%
Spherical slab interpolation simple CMS	1.508 ± 0.009 (s=289)	1.508 ± 0.015 (s=310)	-0.2% .. +0.2%
Spherical fault interpolation simple none	1.131 ± 0.006 (s=409)	1.132 ± 0.006 (s=389)	-0.1% .. +0.2%
Cartesian min max surface	2.176 ± 0.017 (s=207)	2.176 ± 0.019 (s=209)	-0.3% .. +0.3%
Spherical min max surface	6.920 ± 0.020 (s=77)	6.925 ± 0.030 (s=56)	-0.2% .. +0.3%

[tjhei]

Thank you!