Cleaned up warnings reported by the Javadoc tool.

Javadoc reports warnings for things such as missing return descriptions,
missing or wrong parameters, invalid tags.

Note: I didn't touch any of the warnings in the OpenflowJ code.

Change-Id: I7234f617e092b489fad599196fc9cbe78f7e2db1
diff --git a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java
index 4d26cf3..e7182a7 100644
--- a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java
+++ b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZTable.java
@@ -50,7 +50,7 @@
      * increment version, avoiding versionNonexistant.
      *
      * @param version
-     * @return
+     * @return the next version number
      */
     protected static long getNextVersion(final long version) {
         long nextVersion = version + 1;