Fix javadoc <p> tag
@@ -316,8 +316,8 @@ public class SummaryStatistics implements StatisticalSummary {
* among the values that have been added.
* <p>
* Returns <code>Double.NaN</code> if no data values have been added and
- * returns <code>0</code> if there is just one value in the data set.</p>
- * <p>
+ * returns <code>0</code> if there is just one value in the data set.
+ * </p>
* @return second central moment statistic
* @since 2.0
*/
