whitespace change

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1711680 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -148,7 +148,9 @@ public final class FormulaShifter {
         }
     }
     /**
-	 * @return <code>true</code> if this Ptg needed to be changed
+     * @return in-place modified ptg (if row move would cause Ptg to change),
+     * deleted ref ptg (if row move causes an error),
+     * or null (if no Ptg change is needed)
      */
     private Ptg adjustPtgDueToRowMove(Ptg ptg, int currentExternSheetIx) {
         if(ptg instanceof RefPtg) {