minor Kryo related cleanup

Change-Id: I772fc1f776563d30f1a4081c6fddd5739d985263
diff --git a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ProviderIdSerializer.java b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ProviderIdSerializer.java
index 1a1c6f6..f546f63 100644
--- a/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ProviderIdSerializer.java
+++ b/core/store/serializers/src/main/java/org/onlab/onos/store/serializers/ProviderIdSerializer.java
@@ -13,7 +13,7 @@
 public class ProviderIdSerializer extends Serializer<ProviderId> {
 
     /**
-     * Default constructor.
+     * Creates {@link ProviderId} serializer instance.
      */
     public ProviderIdSerializer() {
         // non-null, immutable