fix code snippet case

fulldocset/add/codesnippet/CSharp/servicemetadatabehavior.client/hostapplication.cs

@@ -26,7 +26,7 @@ static void Main()
     private void SnippetEnableHelpPage()
     {
         // see C_HowToSecureEndpoint\cs
-        //<snippet1>
+        //<Snippet1>
         // Create a new metadata behavior object and set its properties to 
         // create a secure endpoint. 
         ServiceMetadataBehavior sb = new ServiceMetadataBehavior();