message: docs: add link to sample global style
diff: @@ -116,3 +116,10 @@ const theme = {
  // 3. That's it! Your app will now read and use the global styles
  ```
  +
  +## Custom global style examples
  +
  +To help you better understand this concept, here are links to projects with
  +custom global styles.
  +
  +- [Gatsby Starter i18n](https://git.habd.as/comfusion/gatsby-starter-i18n-react-i18next/src/branch/master/src/utils/theme.tsx)
  