Fixing 4 javadoc warnings in onos-api

Change-Id: Ib9fe457b463adfb81b5f8a601ce67eb11575f439
diff --git a/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java b/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
index 0dfb77f..1fee24e 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/OpticalPathIntent.java
@@ -156,6 +156,8 @@
 
         /**
          * Sets the intent's direction.
+         *
+         * @param isBidirectional indicates if intent is bidirectional
          * @return this builder
          */
         public Builder bidirectional(boolean isBidirectional) {