[NO ISSUE] Feed operator doc updates

- user model changes: no
- storage format changes: no
- interface changes: no

Change-Id: Ic3ffbcd691b7a864861272282dcbf093e6999e03
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/7463
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>
Reviewed-by: Michael Blow <mblow@apache.org>
diff --git a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaOperatorDescriptor.java b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaOperatorDescriptor.java
index 3f02927..b6fca04 100644
--- a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaOperatorDescriptor.java
+++ b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaOperatorDescriptor.java
@@ -72,7 +72,9 @@
      **/
     private final FeedRuntimeType runtimeType;
 
-    /** Whether the incoming frame has a message that this operator should handle **/
+    /**
+     * Whether the incoming frame has a message that this operator should handle.
+     **/
     private final boolean hasMessage;
 
     public FeedMetaOperatorDescriptor(final JobSpecification spec, final FeedConnectionId feedConnectionId,
diff --git a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaStoreNodePushable.java b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaStoreNodePushable.java
index 7548313..37e589a 100644
--- a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaStoreNodePushable.java
+++ b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/operators/FeedMetaStoreNodePushable.java
@@ -51,10 +51,14 @@
 
     private static final Logger LOGGER = LogManager.getLogger();
 
-    /** Whether the incoming frame has a message that this operator should handle **/
+    /**
+     * Whether the incoming frame has a message that this operator should handle
+     **/
     private final boolean hasMessage;
 
-    /** Runtime node pushable corresponding to the core feed operator **/
+    /**
+     * Runtime node pushable corresponding to the core feed operator
+     **/
     private final AbstractUnaryInputUnaryOutputOperatorNodePushable insertOperator;
 
     /**
@@ -75,10 +79,14 @@
      **/
     private final int partition;
 
-    /** Type associated with the core feed operator **/
+    /**
+     * Type associated with the core feed operator
+     **/
     private final FeedRuntimeType runtimeType = FeedRuntimeType.STORE;
 
-    /** The (singleton) instance of IFeedManager **/
+    /**
+     * The (singleton) instance of IFeedManager
+     **/
     private final ActiveManager feedManager;
 
     private FrameTupleAccessor fta;