Update introduction.md (#1306)

remove strange markups

Author: wxsms

src/guide/ssr/introduction.md

@@ -40,7 +40,7 @@ If you're using [webpack](https://webpack.js.org/), you can add prerendering wit
 
 This guide will be very in-depth and assumes you are already familiar with Vue.js itself, and have a decent working knowledge of Node.js and webpack.
 
-[//]: # 'If you prefer a higher-level solution that provides a smooth out-of-the-box experience, you should probably give [Nuxt.js](https://nuxtjs.org/) a try. It's built upon the same Vue stack but abstracts away a lot of the boilerplate, and provides some extra features such as static site generation. However, it may not suit your use case if you need more direct control of your app's structure. Regardless, it would still be beneficial to read through this guide to understand better how things work together.'
+If you prefer a higher-level solution that provides a smooth out-of-the-box experience, you should probably give [Nuxt.js](https://nuxtjs.org/) a try. It's built upon the same Vue stack but abstracts away a lot of the boilerplate, and provides some extra features such as static site generation. However, it may not suit your use case if you need more direct control of your app's structure. Regardless, it would still be beneficial to read through this guide to understand better how things work together.
 
 [//]: # 'TODO: As you read along, it would be helpful to refer to the official [HackerNews Demo](https://github.com/vuejs/vue-hackernews-2.0/), which makes use of most of the techniques covered in this guide'