Chrome apps FAQ links to apps stack overflow and google group.

Previously the extensions links were used.

NOTRY=true

Review URL: https://codereview.chromium.org/802283003

Cr-Commit-Position: refs/heads/master@{#308403}

chrome/common/extensions/docs/templates/articles/faq.html

@@ -7,8 +7,13 @@
 If you don't find an answer to your question here,
 try the
 <a href="http://code.google.com/chrome/webstore/faq">Chrome Web Store FAQ</a>, the
+{{?is_apps}}
+<a href="http://stackoverflow.com/questions/tagged/google-chrome-app">[google-chrome-app] tag on Stack Overflow</a>, the
+<a href="http://groups.google.com/a/chromium.org/group/chromium-apps">chromium-apps group</a>, or the
+{{:is_apps}}
 <a href="http://stackoverflow.com/questions/tagged/google-chrome-extension">[google-chrome-extension] tag on Stack Overflow</a>, the
-<a href="http://groups.google.com/a/chromium.org/group/chromium-extensions">group</a>, or the
+<a href="http://groups.google.com/a/chromium.org/group/chromium-extensions">chromium-extensions group</a>, or the
+{{/is_apps}}
 <a href="http://www.google.com/support/chrome_webstore/">store help</a>.
 </p>