Make MissingCellPolicy javadocs even more explicit about iterators, as people seem not to quite get it

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@695621 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/usermodel/HSSFRow.java

@@ -545,6 +545,8 @@ public final class HSSFRow implements Comparable {
      * Note that the 4th element might well not be cell 4, as the iterator
      *  will not return un-defined (null) cells.
      * Call getCellNum() on the returned cells to know which cell they are.
+     * As this only ever works on physically defined cells, 
+     *  the {@link MissingCellPolicy} has no effect.
      */
     public Iterator cellIterator()
     {

src/java/org/apache/poi/hssf/usermodel/HSSFWorkbook.java

@@ -382,7 +382,10 @@ public class HSSFWorkbook extends POIDocument
      *  getting missing or blank cells from a row.
      * This will then apply to all calls to
      *  {@link HSSFRow.getCell()}. See
-     *  {@link MissingCellPolicy}
+     *  {@link MissingCellPolicy}.
+     * Note that this has no effect on any
+     *  iterators, only on when fetching Cells
+     *  by their column index.
      */
     public void setMissingCellPolicy(MissingCellPolicy missingCellPolicy) {
         this.missingCellPolicy = missingCellPolicy;