Modify burst buffer example

Modify DataWarb example to use an environment variable rather than absolute path

doc/html/burst_buffer.shtml

@@ -193,8 +193,8 @@ A sample batch script follows:</p>
 #!/bin/bash
 #BB create_persistent name=alpha capacity=32GB access=striped
 #DW jobdw type=scratch capacity=1GB access_mode=striped
-#DW stage_in  type=file source=/home/alan/data.in  destination=/ss/data
-#DW stage_out type=file destination=/home/alan/data.out source=/ss/data
+#DW stage_in  type=file source=/home/alan/data.in  destination=$DW_JOB_STRIPED/data
+#DW stage_out type=file destination=/home/alan/data.out source=$DW_JOB_STRIPED/data
 /home/alan/a.out
 </pre>
 
@@ -303,6 +303,6 @@ $ scontrol create reservation StartTime=16:00 duration=60 \
   BurstBuffer=cray:pool_test:4G
 </pre>
 
-<p style="text-align:center;">Last modified 8 July 2016</p>
+<p style="text-align:center;">Last modified 17 October 2016</p>
 
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