Cleaned up a slew of Javadoc errors in preparation for switch over to Java 8.
diff --git a/core/api/src/main/java/org/onlab/onos/net/intent/IntentId.java b/core/api/src/main/java/org/onlab/onos/net/intent/IntentId.java
index cd75e6f..8c75397 100644
--- a/core/api/src/main/java/org/onlab/onos/net/intent/IntentId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/intent/IntentId.java
@@ -19,8 +19,7 @@
 
 /**
  * Intent identifier suitable as an external key.
- * <p/>
- * This class is immutable.
+ * <p>This class is immutable.</p>
  */
 public final class IntentId implements BatchOperationTarget {