chore: sanitize some input (#3482)

Author: Foxandxss

public/docs/ts/latest/cli-quickstart.jade

@@ -213,7 +213,7 @@ table(width="100%")
         The main HTML page that is served when someone visits your site.
         Most of the time you'll never need to edit it.
         The CLI automatically adds all `js` and `css` files when building your app so you
-        never need to add any `<script>` or `<link>` tags here manually.
+        never need to add any `&lt;script&gt;` or `&lt;link&gt;` tags here manually.
   tr
     td <code>main.ts</code>
     td

public/docs/ts/latest/guide/setup.jade

@@ -8,7 +8,7 @@ a#develop-locally
   The <live-example name=quickstart>QuickStart live-coding</live-example> example is an Angular _playground_.
   It's not where you'd develop a real application. 
   You [should develop locally](#why-locally "Why develop locally") on your own machine ... and that's also how we think you should learn Angular.
-  
+
   Setting up a new project on your machine is quick and easy with the **QuickStart seed**,
   maintained [on github](https://github.com/angular/quickstart "Install the github QuickStart repo"). 
 
@@ -213,7 +213,7 @@ a#why-locally
   * transpiling TypeScript in the browser is slow
   * the type support, refactoring, and code completion only work in your local IDE
 
-  Use the <live-example title="QuickStart Seed in Plunker"><i>live coding</i></live-example> environment as a _playground_, 
+  Use the <live-example title="QuickStart Seed in Plunker">live coding</live-example> environment as a _playground_, 
   a place to try the documentation samples and experiment on your own.
   It's the perfect place to reproduce a bug when you want to
   <a href="https://github.com/angular/angular.io/issues/new" target="_blank" title="File a documentation issue">file a documentation issue</a> or