Fix Javadoc comments with adding <p> tags

Change-Id: I8c2fe1dbfab144530c950fe4038c7f59cff970bc
diff --git a/src/main/java/net/onrc/onos/api/intent/IntentId.java b/src/main/java/net/onrc/onos/api/intent/IntentId.java
index 4ec3e6a..a9a9c78 100644
--- a/src/main/java/net/onrc/onos/api/intent/IntentId.java
+++ b/src/main/java/net/onrc/onos/api/intent/IntentId.java
@@ -5,7 +5,9 @@
 /**
  * The class representing intent's ID.
  *
+ * <p>
  * This class is immutable.
+ * </p>
  */
 public final class IntentId extends BatchOperationTargetId {
     private final long id;
@@ -13,7 +15,9 @@
     /**
      * Constructs the ID corresponding to a given long value.
      *
+     * <p>
      * In the future, this constructor will not be exposed to avoid misuses.
+     * </p>
      *
      * @param id the underlay value of this ID.
      */