Fix typos detected by Frank Wang

Change-Id: I86b2e302569eff89d7051321a4531c7e0dc242f9
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPairId.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPairId.java
index 47d4244..0b44761 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPairId.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortPairId.java
@@ -55,7 +55,7 @@
     }
 
     /**
-     * Returns teh value of port pair id.
+     * Returns the value of port pair id.
      *
      * @return port pair id
      */