HDFS-8257. Namenode rollingUpgrade option is incorrect in document (Contributed by J.Andreina)

(cherry picked from commit c7c26a1e4aff0b89016ec838d06ba2b628a6808e)

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

@@ -327,6 +327,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8037. CheckAccess in WebHDFS silently accepts malformed FsActions
     parameters. (wheat9)
 
+    HDFS-8257. Namenode rollingUpgrade option is incorrect in document
+    (J.Andreina via vinayakumarb)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md

@@ -419,7 +419,7 @@ Usage:
               [-upgrade [-clusterid cid] [-renameReserved<k-v pairs>] ] |
               [-upgradeOnly [-clusterid cid] [-renameReserved<k-v pairs>] ] |
               [-rollback] |
-              [-rollingUpgrade <downgrade |rollback> ] |
+              [-rollingUpgrade <rollback |started> ] |
               [-finalize] |
               [-importCheckpoint] |
               [-initializeSharedEdits] |