message: docs: remove function not utilized in doc example code
diff: @@ -173,7 +173,7 @@ Here's an example that changes the `background-color` and `color` using the
  ```jsx
  function StyleColorMode() {
  - const { colorMode, toggleColorMode } = useColorMode()
  + const { toggleColorMode } = useColorMode()
  const bg = useColorModeValue("red.500", "red.200")
  const color = useColorModeValue("white", "gray.800")
  