Make KllSketch public again as per request from Alex.

src/main/java/org/apache/datasketches/kll/KllSketch.java

@@ -67,7 +67,7 @@
  *
  * @author Lee Rhodes, Kevin Lang
  */
-abstract class KllSketch {
+public abstract class KllSketch {
 
   /**
    * Used to define the variable type of the current instance of this class.

src/main/java/org/apache/datasketches/kll/package-info.java

@@ -148,21 +148,8 @@
  * <li>Then <i>v<sub>lo</sub> &le; v &le; v<sub>hi</sub></i>, with 99% confidence.</li>
  * </ul>
  *
- * <p>The current implementations of the KLL sketch in the DataSketches Java library component include:</p>
- *
- * <ul>
- * <li><b>KllFloatsSketch</b>: This operates on the Java heap and uses the java <i>float</i> primitive for the
- * smallest possible size. It can be serialized to a compact, immutable format or to an updatable format, which can
- * be modified off-heap. </li>
- * <li><b>KllDoublesSketch</b>: This operates on the Java heap and uses the java <i>double</i> primitive for a much
- * larger range of numeric values, and is larger as a result. It can be serialized to a compact, immutable format or
- * to an updatable format, which can be modified off-heap.</li>
- * <li><b>KllFloatsSketchIterator</b>: Iterates over the retained values and weights of the KllFloatsSketch.</li>
- * <li><b>KllDoublesSketchIterator</b>: : Iterates over the retained values and weights of the KllDoublesSketch.</li>
- * </ul>
- *
- * <p>Please visit our website: <a href="https://datasketches.apache.org">DataSketches Home Page</a> for more
- * information.</p>
+ * <p>Please visit our website: <a href="https://datasketches.apache.org">DataSketches Home Page</a> and
+ * the Javadocs for more information.</p>
  *
  * @author Kevin Lang
  * @author Alexander Saydakov