javadoc typo

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1738677 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/dev/BiffViewer.java

@@ -50,7 +50,7 @@ import org.apache.poi.util.POILogger;
 import org.apache.poi.util.StringUtil;
 
 /**
- *  Utillity for reading in BIFF8 records and displaying data from them.
+ *  Utility for reading in BIFF8 records and displaying data from them.
  * @see        #main
  */
 public final class BiffViewer {