Fix typo in react-md example readme (#959)

examples/with-react-md/README.md

@@ -25,6 +25,6 @@ now
 
 ## The idea behind the example
 
-This example features how yo use [react-md](https://react-md.mlaursen.com/) (React Material Design) with Next.js.
+This example features how you use [react-md](https://react-md.mlaursen.com/) (React Material Design) with Next.js.
 
 I recommend reading [layout-component](../layout-component) example next to learn how to reuse the layout across the pages.