Fix misspelling (facebook#3468)

Author: JANG SUN HYUK

packages/react-scripts/template/README.md

@@ -1816,7 +1816,7 @@ npm run analyze
 
 ## Deployment
 
-`npm run build` creates a `build` directory with a production build of your app. Set up your favourite HTTP server so that a visitor to your site is served `index.html`, and requests to static paths like `/static/js/main.<hash>.js` are served with the contents of the `/static/js/main.<hash>.js` file.
+`npm run build` creates a `build` directory with a production build of your app. Set up your favorite HTTP server so that a visitor to your site is served `index.html`, and requests to static paths like `/static/js/main.<hash>.js` are served with the contents of the `/static/js/main.<hash>.js` file.
 
 ### Static Server