Try to work around reactjs#280 by using Markdown for link

Author: gaearon

content/docs/installation.md

@@ -24,7 +24,7 @@ Here are a couple of ways to get started:
 
 If you're just interested in playing around with React, you can use CodePen. Try starting from [this Hello World example code](http://codepen.io/gaearon/pen/rrpgNB?editors=0010). You don't need to install anything; you can just modify the code and see if it works.
 
-If you prefer to use your own text editor, you can also <a href="https://raw.githubusercontent.com/reactjs/reactjs.org/master/static/html/single-file-example.html" download="hello.html">download this HTML file</a>, edit it, and open it from the local filesystem in your browser. It does a slow runtime code transformation, so don't use it in production.
+If you prefer to use your own text editor, you can also [download this HTML file](https://raw.githubusercontent.com/reactjs/reactjs.org/master/static/html/single-file-example.html), edit it, and open it from the local filesystem in your browser. It does a slow runtime code transformation, so don't use it in production.
 
 If you want to use it for a full application, there are two popular ways to get started with React: using Create React App, or adding it to an existing application.