docs(quickstart.js): fix typo (#2614)

declarations instead of declaration

Author: manoharreddyporeddy

public/docs/js/latest/quickstart.jade

@@ -482,7 +482,7 @@ code-example(format="").
   1. Which components and directives we declare in our components
   1. The component to bootstrap at the start 
 
-  We import our lone `app.AppComponent` and add it to both `declaration` and `bootstrap` array.
+  We import our lone `app.AppComponent` and add it to both `declarations` and `bootstrap` array.
 
   Notice that we also add `ng.platformBrowser.BrowserModule` to the `imports` array. 
   This is the Angular Module that contains all the needed Angular bits and pieces to run our app in the browser.