Add note about IE mode tag being included in docs

getting-started.html

@@ -749,6 +749,7 @@ bootstrap/
 {% highlight html %}
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 {% endhighlight %}
+    <p>This tag is included in all docs pages and examples to ensure the best rendering possible in each supported version of Internet Explorer.</p>
     <p>See <a href="http://stackoverflow.com/questions/6771258/whats-the-difference-if-meta-http-equiv-x-ua-compatible-content-ie-edge">this StackOverflow question</a> for more information.</p>
 
     <h3>Internet Explorer 10 in Windows 8 and Windows Phone 8</h3>