WW-2181 SessionAware documentation is misleading about unit testing

git-svn-id: https://svn.apache.org/repos/asf/struts/struts2/trunk@576957 13f79535-47bb-0310-9956-ffa450edef68

core/src/main/java/org/apache/struts2/interceptor/SessionAware.java

@@ -26,10 +26,10 @@ import java.util.Map;
 /**
  * Actions that want access to the user's HTTP session should implement this interface.<p>
  * <p/>
- * This interface is only relevant if the Action is used in a servlet environment.<p>
+ * This will give them access to a Map where they can put objects that can be made available
+ * to subsequent requests.<p/>
  * <p/>
- * Note that using this interface makes the Action tied to a servlet environment, so it should be
- * avoided if possible since things like unit testing will become more difficult.
+ * Typical uses may be cached user data such as name, or a shopping cart.
  *
  */
 public interface SessionAware {