Fix minor javadoc issues

Change-Id: I9803f17ca2b2a21920dccb0e92de6c39f84af315
diff --git a/utils/misc/src/main/java/org/onlab/packet/IGMPGroup.java b/utils/misc/src/main/java/org/onlab/packet/IGMPGroup.java
index 8be75d4..0c89c09 100644
--- a/utils/misc/src/main/java/org/onlab/packet/IGMPGroup.java
+++ b/utils/misc/src/main/java/org/onlab/packet/IGMPGroup.java
@@ -34,8 +34,8 @@
     /**
      * Initialize this object with a multicast group address and additional info.
      *
-     * @param gaddr: the multicast group address for this message type.
-     * @param auxInfo: additional info potentially used by IGMPQuery
+     * @param gaddr the multicast group address for this message type.
+     * @param auxInfo additional info potentially used by IGMPQuery
      */
     public IGMPGroup(IpAddress gaddr, int auxInfo) {
         this.gaddr = gaddr;