Cleaned up warnings reported by the Javadoc tool.

Javadoc reports warnings for things such as missing return descriptions,
missing or wrong parameters, invalid tags.

Note: I didn't touch any of the warnings in the OpenflowJ code.

Change-Id: I7234f617e092b489fad599196fc9cbe78f7e2db1
diff --git a/src/main/java/net/onrc/onos/apps/sdnip/Interface.java b/src/main/java/net/onrc/onos/apps/sdnip/Interface.java
index 15abb1f..b906ba6 100644
--- a/src/main/java/net/onrc/onos/apps/sdnip/Interface.java
+++ b/src/main/java/net/onrc/onos/apps/sdnip/Interface.java
@@ -25,7 +25,7 @@
  *
  * Each interface has a name, which is a unique identifying String that is used
  * to reference this interface in the configuration (for example, to map
- * {@link BgpPeers} to {@code Interfaces}.
+ * {@link BgpPeer}s to {@code Interfaces}.
  */
 public class Interface {
     private final String name;