Update 06_oceanic_plate_temperature.md

[ljhwang]

Fixes a typo and sentence structure.

[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.014 ± 0.005 (s=466)	1.021 ± 0.004 (s=421)	+0.6% .. +0.8%
Slab interpolation curved simple none	1.019 ± 0.003 (s=439)	1.024 ± 0.003 (s=444)	+0.5% .. +0.6%
Spherical slab interpolation simple none	1.186 ± 0.007 (s=375)	1.186 ± 0.006 (s=386)	-0.2% .. +0.1%
Slab interpolation simple curved CMS	1.057 ± 0.004 (s=413)	1.059 ± 0.003 (s=440)	+0.1% .. +0.3%
Spherical slab interpolation simple CMS	1.596 ± 0.010 (s=284)	1.597 ± 0.009 (s=282)	-0.2% .. +0.2%
Spherical fault interpolation simple none	1.158 ± 0.012 (s=380)	1.157 ± 0.010 (s=400)	-0.3% .. +0.1%
Cartesian min max surface	2.197 ± 0.024 (s=217)	2.196 ± 0.026 (s=195)	-0.4% .. +0.3%
Spherical min max surface	7.223 ± 0.031 (s=68)	7.214 ± 0.026 (s=59)	-0.4% .. +0.1%