Clean up javadocs for extension treatment framework.

Change-Id: I56d53ce4b761e1f84907b7eaeb4340c4405f5588
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/ExtensionTreatmentResolver.java b/core/api/src/main/java/org/onosproject/net/behaviour/ExtensionTreatmentResolver.java
index 85f0216..8ca05af 100644
--- a/core/api/src/main/java/org/onosproject/net/behaviour/ExtensionTreatmentResolver.java
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/ExtensionTreatmentResolver.java
@@ -22,13 +22,13 @@
 import org.onosproject.net.flow.instructions.ExtensionTreatmentType;
 
 /**
- * Provides access to the extension implemented by this driver.
+ * Provides access to the extension treatments implemented by this driver.
  */
 @Beta
 public interface ExtensionTreatmentResolver extends HandlerBehaviour {
 
     /**
-     * Gets an extension instruction instance of the specified type, if supported
+     * Gets an extension treatment instance of the specified type, if supported
      * by the driver.
      *
      * @param type type of extension to get