Fix javadoc issues

Change-Id: I68b5e8feba625104f9a5c9eb62a56654ddea0516
diff --git a/core/api/src/main/java/org/onosproject/net/intent/IntentData.java b/core/api/src/main/java/org/onosproject/net/intent/IntentData.java
index ce64ecc..6cd950c 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/IntentData.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/IntentData.java
@@ -108,8 +108,10 @@
     public String toString() {
         return MoreObjects.toStringHelper(getClass())
                 .add("key", key())
+                .add("intent", intent())
                 .add("state", state())
                 .add("version", version())
+                .add("installables", installables())
                 .toString();
     }