began implementing MastershipManager

Change-Id: I65b86dcfa062e4cfd74de588f4714b35e9d329f0
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java b/core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java
index 728e77d..cb4a076 100644
--- a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java
+++ b/core/api/src/main/java/org/onlab/onos/cluster/MastershipStore.java
@@ -25,7 +25,7 @@
                             MastershipRole role);
 
     /**
-     * Adds or updates the mastership information for a device.
+     * Adds or updates mastership information for a device.
      *
      * @param instance controller instance identifier
      * @param deviceId device identifier