Restore extra whitespace in configuration.md

Author: gedeh

docs/configuration.md

@@ -3028,7 +3028,7 @@ Apart from these, the following properties are also available, and may be useful
     For more detail, see the description
     <a href="job-scheduling.html#dynamic-resource-allocation">here</a>.
     <br><br>
-    This requires one of the following conditions:
+    This requires one of the following conditions: 
     1) enabling external shuffle service through <code>spark.shuffle.service.enabled</code>, or
     2) enabling shuffle tracking through <code>spark.dynamicAllocation.shuffleTracking.enabled</code>, or
     3) enabling shuffle blocks decommission through <code>spark.decommission.enabled</code> and <code>spark.storage.decommission.shuffleBlocks.enabled</code>, or