message: docs: update css-variables.mdx
diff: @@ -6,7 +6,7 @@ description: Working with color mode (light and dark mode) in Chakra UI
  Chakra UI now converts theme tokens (colors, font sizes, stc) to CSS Custom
  Properties (also known as "CSS variables").
  -CSS variables are now supported in all modern browsers, and we think it they are
  +CSS variables are now supported in all modern browsers, and we think they are
  useful to:
  - avoid prop interpolations;
  