message: fix documentation links
  They were added as relative and ending up as `https://github.com/Shopify/ui-extensions/blob/main/packages/admin-ui-extensions/packages/admin-ui-extensions/src/components` when clicked.
  Fixes
diff: @@ -24,6 +24,6 @@ extend('Playground', (root) => {
  });
  ```
  -You can find more component usage examples alongside each component in [packages/admin-ui-extensions/src/components](packages/admin-ui-extensions/src/components)
  +You can find more component usage examples alongside each component in [packages/admin-ui-extensions/src/components](/packages/admin-ui-extensions/src/components)
  -To use the React implementation, check out [packages/admin-ui-extensions-react](packages/admin-ui-extensions/README.md).
  +To use the React implementation, check out [packages/admin-ui-extensions-react](/packages/admin-ui-extensions/README.md).
  