s/to sort based/to the sort based/ and tag as 1.5+

Author: holdenk

docs/configuration.md

@@ -459,9 +459,9 @@ Apart from these, the following properties are also available, and may be useful
   <td>sort</td>
   <td>
     Implementation to use for shuffling data. There are three implementations available:
-    <code>sort</code>, <code>hash</code> and the new <code>tungsten-sort</code>.
+    <code>sort</code>, <code>hash</code> and the new (1.5+) <code>tungsten-sort</code>.
     Sort-based shuffle is more memory-efficient and is the default option starting in 1.2.
-    Tungsten-sort is similar to sort based shuffle, with a direct binary cache-friendly
+    Tungsten-sort is similar to the sort based shuffle, with a direct binary cache-friendly
     implementation with a fall back to regular sort based shuffle if its requirements are not
     met.
   </td>