fixed link to blog entry (SPR-6691)

spring-framework-reference/src/beans.xml

@@ -2297,7 +2297,7 @@ public class CommandManager implements ApplicationContextAware {
 
       <sidebar>
         <para>You can read more about the motivation for Method Injection in
-        <ulink url="http://blog.springframework.com/rod/?p=1">this blog
+        <ulink url="http://blog.springsource.com/2004/08/06/method-injection/">this blog
         entry</ulink>.</para>
       </sidebar>