YARN-1570. Fixed formatting of the lines in YarnCommands.apt.vm docs source. Contributed by Akira Ajisaka.
svn merge --ignore-ancestry -c 1579797 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1579801 13f79535-47bb-0310-9956-ffa450edef68