Javadoc fixes

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1712606 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/ss/formula/FormulaShifter.java

@@ -457,7 +457,7 @@ public final class FormulaShifter {
      * Returns <code>null</code> or {@link #RefErrorPtg} if no change was made
      *
      * @param aptg
-     * @return
+     * @return The Ptg reference if the cell would move due to copy, otherwise null
      */
     private Ptg rowCopyRefPtg(RefPtgBase rptg) {
         final int refRow = rptg.getRow();

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFSheet.java

@@ -1291,7 +1291,7 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet {
      * @param startRow the first row number in this sheet to return
      * @param endRow the last row number in this sheet to return
      * @param createRowIfMissing
-     * @return
+     * @return All rows between startRow and endRow, inclusive
      * @throws IllegalArgumentException if startRowNum and endRowNum are not in ascending order
      */
     private List<XSSFRow> getRows(int startRowNum, int endRowNum, boolean createRowIfMissing) {