docs: fix typo (#498)

Author: nhducit

docs/guide/README.md

@@ -6,7 +6,7 @@ Each page generated by VuePress has its own pre-rendered static HTML, providing
 
 ## How It Works
 
-A VuePress site is in fact an SPA powered by [Vue](http://vuejs.org/), [Vue Router](https://github.com/vuejs/vue-router) and [webpack](http://webpack.js.org/). If you've used Vue before, you will notice the familiar development experience when you are writing or developing custom themes (you can even use Vue DevTools to debug your custom theme!).
+A VuePress site is in fact a SPA powered by [Vue](http://vuejs.org/), [Vue Router](https://github.com/vuejs/vue-router) and [webpack](http://webpack.js.org/). If you've used Vue before, you will notice the familiar development experience when you are writing or developing custom themes (you can even use Vue DevTools to debug your custom theme!).
 
 During the build, we create a server-rendered version of the app and render the corresponding HTML by virtually visiting each route. This approach is inspired by [Nuxt](https://nuxtjs.org/)'s `nuxt generate` command and other projects like [Gatsby](https://www.gatsbyjs.org/).