Implemented the extension framework for selectors.

Change-Id: I577900141889fc70ca54e96cd5d54cfd5194b05d
diff --git a/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java b/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java
index 821c1d9..9715fc0 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java
@@ -22,7 +22,7 @@
 import java.util.Objects;
 
 /**
- * Type of extension instructions.
+ * Type of treatment extensions.
  */
 @Beta
 public final class ExtensionTreatmentType {