Renamed *NetworkGraph* references to *Topology*.

Change-Id: Iec01c47086e1518592c0753e75395d3fe5abcde3
diff --git a/src/main/java/net/onrc/onos/core/topology/Port.java b/src/main/java/net/onrc/onos/core/topology/Port.java
index 44f4bcf..9a0c06e 100644
--- a/src/main/java/net/onrc/onos/core/topology/Port.java
+++ b/src/main/java/net/onrc/onos/core/topology/Port.java
@@ -6,7 +6,7 @@
 //immutable object, or a copy of the original "SB" In-memory Topology.
 
 /**
- * Interface of Port object in Network Graph topology.
+ * Interface of Port object in the topology.
  */
 public interface Port {