Adding and fixing javados.

Change-Id: I38eddb0b11630cdd83c5d1e5d5dc393ee2555897
diff --git a/core/api/src/main/java/org/onosproject/net/intent/package-info.java b/core/api/src/main/java/org/onosproject/net/intent/package-info.java
index 601d976..5aad747 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/package-info.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/package-info.java
@@ -75,7 +75,9 @@
  * performs global recomputation/optimization across all prior intents.
  * </p>
  * <p>
- * <img src="doc-files/intent-subsystem.png" alt="ONOS intent subsystem">
+ * The figure below depicts the general interactions between different
+ * components of the intent subsystem.<br>
+ * <img src="doc-files/intent-design.png" alt="ONOS intent subsystem design">
  * </p>
  */
 package org.onosproject.net.intent;