Update javadocs

src/main/java/com/yahoo/sketches/quantiles/HeapQuantilesSketch.java

@@ -111,7 +111,7 @@ private HeapQuantilesSketch(int k, short seed) {
    * Obtains an instance of a QuantileSketch of double elements.
    * 
    * @param k Parameter that controls space usage of sketch and accuracy of estimates. 
-   * Must be greater than one and less than 65536.
+   * Must be greater than 0 and less than 65536.
    * It is recommended that <i>k</i> be a power of 2 to enable merging of sketches with
    * different values of <i>k</i>.
    */

src/main/java/com/yahoo/sketches/quantiles/QuantilesSketchBuilder.java

@@ -37,7 +37,7 @@ public QuantilesSketchBuilder() {
 
   /**
    * Sets the parameter <i>k</i> that determines the accuracy and size of the sketch
-   * @param k determines the accuracy and size of the sketch.  <i>k</i> must be greater than 1 and
+   * @param k determines the accuracy and size of the sketch.  <i>k</i> must be greater than 0 and
    * less than 65536.
    * It is recommended that <i>k</i> be a power of 2 to enable merging of sketches with
    * different values of <i>k</i>.
@@ -115,7 +115,7 @@ public QuantilesSketch build() {
    * Returns a QuantilesSketch with the current configuration of this Builder and the
    * given parameter <i>k</i>.
    * @param k determines the accuracy and size of the sketch.  
-   * Must be greater than 1 and less than 65536.
+   * Must be greater than 0 and less than 65536.
    * @return a QuantilesSketch
    */
   public QuantilesSketch build(int k) {

src/main/java/com/yahoo/sketches/quantiles/Util.java

@@ -405,7 +405,6 @@ static double getAdjustedEpsilon(int k) {
      * @return the resulting epsilon
      */ //used only by getAdjustedEpsilon()
     private static double getTheoreticalEpsilon(int k, double ff) {
-      //TODO return something if k == 1 !!
       if (k < 2) throw new IllegalArgumentException("K must be greater than one.");
       // don't need to check in the other direction because an int is very small
       double kf = k*ff;