Move HDFS-8615 from 2.8.0 to 2.6.3 in CHANGES.txt.

(cherry picked from commit b82a6cee4b74230322eb9fbf1b522947463cb343)

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

@@ -1102,9 +1102,6 @@ Release 2.8.0 - UNRELEASED
     HDFS-8551. Fix hdfs datanode CLI usage message.
     (Brahma Reddy Battula via xyao)
 
-    HDFS-8615. Correct HTTP method in WebHDFS document.
-    (Brahma Reddy Battula via aajisaka)
-
     HDFS-8337. Accessing httpfs via webhdfs doesn't work from a jar with
     kerberos. (Yongjun Zhang)
 
@@ -2615,6 +2612,9 @@ Release 2.6.3 - UNRELEASED
 
   BUG FIXES
 
+    HDFS-8615. Correct HTTP method in WebHDFS document.
+    (Brahma Reddy Battula via aajisaka)
+
 Release 2.6.2 - 2015-10-28
 
   INCOMPATIBLE CHANGES