Revise the HDFS-6584 entry CHANGES.txt.

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -6,8 +6,8 @@ Release 2.6.0 - UNRELEASED
 
   NEW FEATURES
 
-    HDFS-6584. Support archival storage; see the detail subtasks in the
-    breakdown section.  (szetszwo)
+    HDFS-6584. Support archival storage.  (See breakdown of tasks below for
+    features and contributors)
 
   IMPROVEMENTS