Documentation: replace <b> with <code>

Author: msiddalingaiah

docs/programming-guide.md

@@ -935,7 +935,7 @@ for details.
     This always shuffles all data over the network. </td>
 </tr>
 <tr>
-  <td> <b>repartitionAndSortWithinPartitions</b>(<i>partitioner</i>) </td>
+  <td> <code>repartitionAndSortWithinPartitions</code>(<i>partitioner</i>) </td>
   <td> Repartition the RDD according to the given partitioner and, within each resulting partition,
   sort records by their keys. This is more efficient than calling <b>repartition</b> and then sorting within 
   each partition because it can push the sorting down into the shuffle machinery. </td>