Update index.md

[ljhwang]

Continuing to clean-up typos.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1337ec5) 93.55% compared to head (001a450) 93.55%.
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #571   +/-   ##
=======================================
  Coverage   93.55%   93.55%           
=======================================
  Files          92       92           
  Lines        6343     6343           
=======================================
  Hits         5934     5934           
  Misses        409      409           

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.022 ± 0.003 (s=427)	1.022 ± 0.003 (s=456)	-0.1% .. +0.0%
Slab interpolation curved simple none	1.028 ± 0.003 (s=415)	1.028 ± 0.005 (s=463)	-0.1% .. +0.1%
Spherical slab interpolation simple none	1.267 ± 0.010 (s=352)	1.265 ± 0.003 (s=361)	-0.3% .. +0.0%
Slab interpolation simple curved CMS	1.101 ± 0.003 (s=406)	1.097 ± 0.005 (s=415)	-0.4% .. -0.2%
Spherical slab interpolation simple CMS	1.860 ± 0.005 (s=245)	1.860 ± 0.006 (s=241)	-0.1% .. +0.1%
Spherical fault interpolation simple none	1.278 ± 0.007 (s=345)	1.277 ± 0.005 (s=362)	-0.2% .. +0.1%
Cartesian min max surface	2.386 ± 0.013 (s=183)	2.390 ± 0.020 (s=196)	-0.1% .. +0.4%
Spherical min max surface	7.358 ± 0.025 (s=48)	7.355 ± 0.016 (s=77)	-0.2% .. +0.2%