message: Update: small fix.
diff: @@ -33,10 +33,10 @@ As we use Gatsby of version 2, we need to do some tricks to architect a UI tree.
  <RootWrapper>
  ```
  -RootWrapper: This stays at the most outside of the application wrapping Root element which is gatsby's default root element.
  -Root: This is Gatsby's default root element.
  -Page Element(s): This is equivalent to each element in the `pages` directory. This will be mounted and unmounted as navigations happen.
  -Layout(s): This is equivalent to each element in the `layouts` directory. This stays inside a page element, so this will be mounted and unmouted as well like page elements.
  +- RootWrapper: This stays at the most outside of the application wrapping Root element which is gatsby's default root element.
  +- Root: This is Gatsby's default root element.
  +- Page Element(s): This is equivalent to each element in the `pages` directory. This will be mounted and unmounted as navigations happen.
  +- Layout(s): This is equivalent to each element in the `layouts` directory. This stays inside a page element, so this will be mounted and unmouted as well like page elements.
  ### State Management
  