Update running_mock_server_detail.html - fix 404

Fix a 404 link

jekyll-www.mock-server.com/mock_server/_includes/running_mock_server_detail.html

@@ -196,7 +196,7 @@ <h2>Client API&nbsp;&nbsp;-&nbsp;&nbsp;starting and stopping</h2>
 }</code></pre>
 
 <p>The <a href="https://github.com/jamesdbloom/mockserver/tree/master/mockserver-examples">mockserver-example</a> project contains an example test called
-	<a href="https://github.com/jamesdbloom/mockserver/blob/master/mockserver-examples/src/test/java/org/mockserver/examples/web/controller/BooksPageIntegrationTest.java">BookPageIntegrationTest</a> that demonstrates a fully working example.</p>
+	<a href="https://github.com/jamesdbloom/mockserver/blob/master/mockserver-examples/src/test/java/org/mockserver/examples/proxy/web/controller/BooksPageIntegrationTest.java">BookPageIntegrationTest</a> that demonstrates a fully working example.</p>
 
 <a name="junit_rule" class="anchor" href="#junit_rule">&nbsp;</a>