message: docs(switch): wrap usage code with FormControl
diff: @@ -31,10 +31,10 @@ import { Switch } from "@chakra-ui/core"
  ## Usage
  ```jsx
  -<Flex justify="center" align="center">
  +<FormControl as={Flex} justifyContent="center" alignItems="center">
  <FormLabel htmlFor="email-alerts">Enable email alerts?</FormLabel>
  <Switch id="email-alerts" />
  -</Flex>
  +</FormControl>
  ```
  ## Sizes
  