fix spelling of Usage

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1871987 13f79535-47bb-0310-9956-ffa450edef68

src/scratchpad/src/org/apache/poi/hslf/dev/SlideShowDumper.java

@@ -68,7 +68,7 @@ public final class SlideShowDumper {
   public static void main(String[] args) throws IOException
   {
 	if(args.length == 0) {
-		System.err.println("Useage: SlideShowDumper [-escher|-basicescher] <filename>");
+		System.err.println("Usage: SlideShowDumper [-escher|-basicescher] <filename>");
 		return;
 	}
 

src/scratchpad/src/org/apache/poi/hslf/extractor/PowerPointExtractor.java

@@ -59,7 +59,7 @@ public final class PowerPointExtractor extends POIOLE2TextExtractor {
 	 */
 	public static void main(String[] args) throws IOException {
 		if (args.length < 1) {
-			System.err.println("Useage:");
+			System.err.println("Usage:");
 			System.err.println("\tPowerPointExtractor [-notes] <file>");
 			System.exit(1);
 		}

src/scratchpad/src/org/apache/poi/hslf/extractor/QuickButCruddyTextExtractor.java

@@ -64,7 +64,7 @@ public final class QuickButCruddyTextExtractor {
     public static void main(String[] args) throws IOException
     {
         if(args.length < 1) {
-            System.err.println("Useage:");
+            System.err.println("Usage:");
             System.err.println("\tQuickButCruddyTextExtractor <file>");
             System.exit(1);
         }