HADOOP-9302. HDFS docs not linked from top level (Andy Isaacson via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1445649 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9303. command manual dfsadmin missing entry for restoreFailedStorage option (Andy Isaacson via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1445658 13f79535-47bb-0310-9956-ffa450edef68