Move HDFS-8914 from 2.8.0 to 2.7.3 in CHANGES.txt.

(cherry picked from commit 2cb5afffc4c546e3d0d0f68a921905967047b0e0)

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

@@ -1586,9 +1586,6 @@ Release 2.8.0 - UNRELEASED
     HDFS-9443. Disabling HDFS client socket cache causes logging message
     printed to console for CLI commands. (Chris Nauroth via wheat9)
 
-    HDFS-8914. Document HA support in the HDFS HdfsDesign.md.
-    (Lars Francke via wheat9)
-
     HDFS-6885. Fix wrong use of BytesWritable in FSEditLogOp#RenameOp.
     (Yi Liu via wheat9)
 
@@ -1699,6 +1696,9 @@ Release 2.7.3 - UNRELEASED
     HDFS-9505. HDFS Architecture documentation needs to be refreshed.
     (Masatake Iwasaki via aajisaka)
 
+    HDFS-8914. Document HA support in the HDFS HdfsDesign.md.
+    (Lars Francke via wheat9)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES