adding javadoc to intent classes: Action, FlowEntry, ForwardAction, Match

Change-Id: Ia7d6475adc7c88430deeb182e22604d766252c2c
diff --git a/src/main/java/net/onrc/onos/core/intent/Action.java b/src/main/java/net/onrc/onos/core/intent/Action.java
index 6490fe5..100dc33 100644
--- a/src/main/java/net/onrc/onos/core/intent/Action.java
+++ b/src/main/java/net/onrc/onos/core/intent/Action.java
@@ -3,10 +3,15 @@
 import net.onrc.onos.core.util.FlowEntryAction;
 
 /**
- * @author Brian O'Connor <bocon@onlab.us>
+ * An abstract class that represents an OpenFlow action.
  */
 
 public abstract class Action {
 
+    /**
+     * This function converts the Action into a legacy FlowEntryAction.
+     *
+     * @return an equivalent FlowEntryAction object
+     */
     public abstract FlowEntryAction getFlowEntryAction();
 }