javadoc fixes

Change-Id: I3b4fc2d99f42b2413a535fb411b9c19bdd186ad8
diff --git a/cli/src/main/java/org/onlab/onos/cli/AbstractShellCommand.java b/cli/src/main/java/org/onlab/onos/cli/AbstractShellCommand.java
index 35dc2a2..122245a 100644
--- a/cli/src/main/java/org/onlab/onos/cli/AbstractShellCommand.java
+++ b/cli/src/main/java/org/onlab/onos/cli/AbstractShellCommand.java
@@ -92,6 +92,7 @@
     /**
      * Produces a JSON object from the specified key/value annotations.
      *
+     * @param mapper ObjectMapper to use while converting to JSON
      * @param annotations key/value annotations
      * @return JSON object
      */