Update references to sandbox app samples.

chrome/common/extensions/docs/server2/templates/articles/app_external.html

Index: chrome/common/extensions/docs/server2/templates/articles/app_external.html
diff --git a/chrome/common/extensions/docs/server2/templates/articles/app_external.html b/chrome/common/extensions/docs/server2/templates/articles/app_external.html
index 581f6b6305b2aaf9dab35e240f47fc9b59de3e95..b88c0b2a4279c60ee6ba49c2bfef543d55f9ab76 100644
--- a/chrome/common/extensions/docs/server2/templates/articles/app_external.html
+++ b/chrome/common/extensions/docs/server2/templates/articles/app_external.html
@@ -18,11 +18,10 @@ and indirectly access the APIs.
 </p>
 
 <p class="note">
-<b>API Samples: </b>
+<b>API Sample: </b>
 Want to play with the code?
 Check out the
-<a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/eval-in-iframe">eval-in-iframe</a>
-and <a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/regex-tester">regex-tester</a> samples.
+<a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/sandbox">sandbox</a> sample.
 </p>
 
 <h2 id="external">Referencing external resources</h2>
@@ -279,4 +278,4 @@ var messageHandler = function(e) {
 window.addEventListener('message', messageHandler);
 </pre>
 
-<p class="backtotop"><a href="#top">Back to top</a></p>
+<p class="backtotop"><a href="#top">Back to top</a></p>