HADOOP-6985. Fix example to make more sense.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1027301 13f79535-47bb-0310-9956-ffa450edef68

conf/hadoop-env.sh.template

@@ -15,7 +15,7 @@
 # export HADOOP_HEAPSIZE=2000
 
 # Extra Java runtime options.  Empty by default.
-# if [ "$HADOOP_OPTS" == "" ]; then export HADOOP_OPTS=-server; else FOO+=" -server"; fi
+# if [ "$HADOOP_OPTS" == "" ]; then export HADOOP_OPTS=-server; else HADOOP_OPTS+=" -server"; fi
 
 # Command specific options appended to HADOOP_OPTS when specified
 export HADOOP_NAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_NAMENODE_OPTS"