Replace old qt-project.org wiki with wiki.qt.io

Change-Id: If9f4b7bcfa4bfffffd5180600981ca0f16f6da8f
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

examples/webenginewidgets/browser/data/defaultbookmarks.xbel

@@ -18,7 +18,7 @@
         <bookmark href="http://qt-apps.org/">
             <title>Qt-Apps.org</title>
         </bookmark>
-        <bookmark href="http://qt-project.org/wiki/OnlineCommunities/">
+        <bookmark href="http://wiki.qt.io/?title=OnlineCommunities">
             <title>Online Communities</title>
         </bookmark>
         <bookmark href="http://www.chromium.org/">