fix for metro principles link (jqm demo)

samples/jqm-public-demo/index.html

@@ -134,7 +134,7 @@ <h2>Welcome</h2>
             <p>The aim of this theme to provide metro-style user interface for web pages based on jquery mobile.</p>
             <p>While the theme itself adds all metro specific colors
                 and fonts by default, please don't forget to follow <a
-                        href="http://www.microsoft.com/design/toolbox/tutorials/windows-phone-7/metro/">metro
+                        href="http://msdn.microsoft.com/en-us/library/hh202915(v=VS.92).aspx">metro
                     principles</a>.</p>
 
             <h2>Browse</h2>