Slight README tweak

Author: csandman

README.md

@@ -732,7 +732,7 @@ By default, `react-hook-form` uses [uncontrolled components](https://reactjs.org
 - `useController` single select
   - Vanilla JS: https://codesandbox.io/s/chakra-react-select-react-hook-form-usecontroller-single-select-vanilla-js-v3-yi33cn?file=/example.js
   - TypeScript: https://codesandbox.io/s/chakra-react-select-react-hook-form-usecontroller-single-select-typescript-v3-3hvkm7?file=/app.tsx
-- Multi select with `yup` validation
+- Multi select with `yup` validation (advanced example)
   - Vanilla JS: https://codesandbox.io/s/chakra-react-select-react-hook-form-with-yup-validation-v3-iptkhu?file=/src/app.js
   - TypeScript: https://codesandbox.io/s/chakra-react-select-react-hook-form-with-yup-validation-typescript-v3-odjkbd?file=/app.tsx