Merge pull request #12517 from twbs/getting-started-SO

add StackOverflow to Community section of Getting Started docs

docs/getting-started.html

@@ -319,6 +319,7 @@ bootstrap/
   <ul>
     <li>Read and subscribe to <a href="http://blog.getbootstrap.com/">The Official Bootstrap Blog</a>.</li>
     <li>Chat with fellow Bootstrappers using IRC in the <code>irc.freenode.net</code> server, in the <a href="irc://irc.freenode.net/#twitter-bootstrap">##twitter-bootstrap channel</a>.</li>
+    <li>For help using Bootstrap, ask on <a href="http://stackoverflow.com/questions/tagged/twitter-bootstrap-3">StackOverflow using the tag <code>twitter-bootstrap-3</code></a>.</li>
     <li>Find inspiring examples of people building with Bootstrap at the <a href="http://expo.getbootstrap.com">Bootstrap Expo</a>.</li>
   </ul>
   <p>You can also follow <a href="https://twitter.com/twbootstrap">@twbootstrap on Twitter</a> for the latest gossip and awesome music videos.</p>