a few language corrections for https://bottosson.github.io/posts/colorpicker/

[GerHobbelt]

As the page render is bloody hard to diff sensibly, here's the actual changes:

"is a about" --> "is about"

"would would" --> "what would"

"best possible an appearance modelling color space" --> "best possible appearance a modelling color space"

"of slices Okhsl" --> "of slices in Okhsl" (alt: "of slices of Okhsl" but for me 'in' reads better than the more technical correct 'of')

"variation is absolute brightness" --> "variation in absolute brightness"

"but with and added" --> "but with an added"

---

(I wrote the git commit message as I went, so it says "two English typos.." because that's when I decided to send an edit => pullreq.)

Thanks for coming up with OKlab and writing these blog articles. Much appreciated!