Fix javadoc errors

Change-Id: Ia6c66e3485465a3fb1d90198839e9e4ee214fdf8
diff --git a/src/main/java/net/onrc/onos/core/topology/LinkType.java b/src/main/java/net/onrc/onos/core/topology/LinkType.java
index 1c9d9d1..b0450c8 100644
--- a/src/main/java/net/onrc/onos/core/topology/LinkType.java
+++ b/src/main/java/net/onrc/onos/core/topology/LinkType.java
@@ -2,15 +2,15 @@
 
 public enum LinkType {
     /**
-     * Ethernet link is link between {@link PortType.ETHERNET_PORT}.
+     * Ethernet link is link between {@link PortType#ETHERNET_PORT}.
      */
     ETHERNET_LINK,
     /**
-     * WDM Link is link between {@link PortType.WDM_PORT}.
+     * WDM Link is link between {@link PortType#WDM_PORT}.
      */
     WDM_LINK,
     /**
-     * This link is link between {@link PortType.ETHERNET_PORT} and {@link PortType.TRANSPONDER_PORT}.
+     * This link is link between {@link PortType#ETHERNET_PORT} and {@link PortType#TRANSPONDER_PORT}.
      */
     PACKET_TPORT_LINK;
 }