HDFS-13919. Documentation: Improper formatting in Disk Balancer for Settings.

Contributed by Ayush Saxena.

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSDiskbalancer.md

@@ -127,6 +127,7 @@ There is a set of diskbalancer settings that can be controlled via hdfs-site.xml
 |`dfs.disk.balancer.block.tolerance.percent`| The tolerance percent specifies when we have reached a good enough value for any copy step. For example, if you specify 10% then getting close to 10% of the target value is good enough.|
 |`dfs.disk.balancer.plan.threshold.percent`| The percentage threshold value for volume Data Density in a plan. If the absolute value of volume Data Density which is out of threshold value in a node, it means that the volumes corresponding to the disks should do the balancing in the plan. The default value is 10.|
 |`dfs.disk.balancer.plan.valid.interval`| Maximum amount of time disk balancer plan is valid. Supports the following suffixes (case insensitive): ms(millis), s(sec), m(min), h(hour), d(day) to specify the time (such as 2s, 2m, 1h, etc.). If no suffix is specified then milliseconds is assumed. Default value is 1d|
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  Debugging
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