Javadoc fixes.

Change-Id: Ic2cef19a6f1af9916c8615c9319cc122d9da5383
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceStore.java b/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceStore.java
index 85ee89c..79f7a3e 100644
--- a/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceStore.java
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceStore.java
@@ -43,6 +43,7 @@
      * Releases resources.
      *
      * @param allocations resources to be released
+     * @return the link resource event
      */
     LinkResourceEvent releaseResources(LinkResourceAllocations allocations);