Merge -r 1411761:1411762 from trunk to branch-0.23.5. Fixes: HADOOP-8860. Split MapReduce and YARN sections in documentation navigation.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23.5@1411771 13f79535-47bb-0310-9956-ffa450edef68
14 files changed