[MATH-1001] Added additional clarification to javadoc wrt byte and short parameters.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1519820 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/math3/stat/Frequency.java

@@ -42,6 +42,9 @@ import org.apache.commons.math3.util.MathUtils;
  * Integer values (int, long, Integer, Long) are not distinguished by type --
  * i.e. <code>addValue(Long.valueOf(2)), addValue(2), addValue(2l)</code> all have
  * the same effect (similarly for arguments to <code>getCount,</code> etc.).</p>
+ * <p>NOTE: byte and short values will be implicitly converted to int values
+ * by the compiler, thus there are no explicit overloaded methods for these
+ * primitive types.</p>
  * <p>
  * char values are converted by <code>addValue</code> to Character instances.
  * As such, these values are not comparable to integral values, so attempts