Fix Javadoc warnings

Change-Id: Icf8b6b6f77ea80d3975aa975226a178145067adf
diff --git a/core/api/src/main/java/org/onosproject/store/service/StorageService.java b/core/api/src/main/java/org/onosproject/store/service/StorageService.java
index 53830c2..1e006eb 100644
--- a/core/api/src/main/java/org/onosproject/store/service/StorageService.java
+++ b/core/api/src/main/java/org/onosproject/store/service/StorageService.java
@@ -102,6 +102,8 @@
 
     /**
      * Returns an instance of {@code WorkQueue} with specified name.
+     *
+     * @param <E> work element type
      * @param name work queue name
      * @param serializer serializer
      *