Fix comments

- Delete obsolete TODO comment
- Write Javadoc for IntentUpdate subclasses which have no Javadoc

Change-Id: I2b233fa9741733fd3642bbbe639990b1ce0b7405

@@ -26,6 +26,9 @@ import java.util.Optional;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
+/**
+ * Represents a phase where an intent is being compiled.
+ */
 class Compiling implements IntentUpdate {
 
     private static final Logger log = LoggerFactory.getLogger(Compiling.class);

@@ -21,7 +21,9 @@ import java.util.Optional;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-// TODO pull out the IntentUpdate inner classes
+/**
+ * Represents a phase where intent installation has been requested.
+ */
 class InstallRequest implements IntentUpdate {
 
     // TODO: define an interface and use it, instead of IntentManager

@@ -20,6 +20,9 @@ import org.onosproject.net.intent.IntentData;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.onosproject.net.intent.IntentState.INSTALLING;
 
+/**
+ * Represent a phase where an intent has been installed.
+ */
 class Installed extends CompletedIntentUpdate {
 
     private final IntentData intentData;

@@ -21,6 +21,9 @@ import org.onosproject.net.intent.IntentState;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.onosproject.net.intent.IntentState.WITHDRAWING;
 
+/**
+ * Represents a phase where an intent has been withdrawn.
+ */
 class Withdrawn extends CompletedIntentUpdate {
 
     private final IntentData intentData;