Fix CSS var name (#547)

Author: aarongarciah

docs/src/content/docs/color.mdx

@@ -22,7 +22,7 @@ Open Props v2 has 360*1000 color palette,s in just 19 variables.
 In this new workflow you import the palette props. This gives you access to 
 `--color-{1-16}`. Customize the palette with 1-3 palette props: 
 - `--palette-hue`
-- `--palette-hueRotateBy`
+- `--palette-hue-rotate-by`
 - `--palette-chroma`
 
 Tint with any hue, add hue rotation along the palette for intrigue,