Cleaning up Javadocs in core-ui classes.
Added common constants to AbstractCellFormatter.

Change-Id: Ie20ea62f059646e7d6c7f3660dd60a60c40532fe
diff --git a/core/api/src/main/java/org/onosproject/ui/model/topo/UiClusterMember.java b/core/api/src/main/java/org/onosproject/ui/model/topo/UiClusterMember.java
index d8803ab..f0aae01 100644
--- a/core/api/src/main/java/org/onosproject/ui/model/topo/UiClusterMember.java
+++ b/core/api/src/main/java/org/onosproject/ui/model/topo/UiClusterMember.java
@@ -43,7 +43,7 @@
      * topology instance and the specified controller node instance.
      *
      * @param topology parent topology containing this cluster member
-     * @param cnode    underlying controller node.
+     * @param cnode    underlying controller node
      */
     public UiClusterMember(UiTopology topology, ControllerNode cnode) {
         this.topology = topology;