svn merge -c 1580013 from trunk for merging site.xml (missing from previous commit)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1580018 13f79535-47bb-0310-9956-ffa450edef68

hadoop-project/src/site/site.xml

@@ -69,6 +69,7 @@
       <item name="High Availability With QJM" href="hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html"/>
       <item name="High Availability With NFS" href="hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithNFS.html"/>
       <item name="Federation" href="hadoop-project-dist/hadoop-hdfs/Federation.html"/>
+      <item name="ViewFs Guide" href="hadoop-project-dist/hadoop-hdfs/ViewFs.html"/>
       <item name="HDFS Snapshots" href="hadoop-project-dist/hadoop-hdfs/HdfsSnapshots.html"/>
       <item name="HDFS Architecture" href="hadoop-project-dist/hadoop-hdfs/HdfsDesign.html"/>
       <item name="Edits Viewer" href="hadoop-project-dist/hadoop-hdfs/HdfsEditsViewer.html"/>